## Description

This improves defaults generation with logging, stats, and token validation. 

This PR includes these changes:
* introduce `TokenLogger`, with a verbose mode
  * prints versions and tokens usage to the console
  * outputs `generated/used_tokens.csv`, a list of all used tokens, for use by Google
* find token files in `data` automatically
* hide tokens `Map`
  * tokens can be obtained using existing resolvers (e.g. `color`, `shape`), or directly through `getToken`.
  * tokens can be checked for existence with `tokenAvailable`
* remove version from template, since the tokens are aggregated and multiple versions are possible (as is the case currently), it does not make sense to attribute a single version
* improve documentation

## Related Issues
 - Fixes https://github.com/flutter/flutter/issues/122602

## Tests
 - Added tests for `TokenLogger`
 - Regenerated tokens, no-op except version removal

## Future work
A future PR should replace or remove the following invalid tokens usages

<img width="578" alt="image" src="https://github.com/flutter/flutter/assets/6655696/b6f9e5a7-523f-4f72-94f9-1b0bf4cc9f00">

This fixes an issue where the bottom sheet would rebuild when `enableDrag` is set to true on every tap. This is because `DragGestureRecognizer` would win the arena by default and dispatch the `drag` callbacks (in `acceptGesture`) even though it had not met the drag threshold. This changes keep the default behavior of `DragGestureRecognizer` the same, but adds a parameter `onlyAcceptDragOnThreshold` that a user can use to stop drag callbacks from being fired when the drag threshold has not been met.

Fixes #126833

Adds barrierLabel as optional param in showModalBottomSheet

Fixes #83180

Support keeping a bottom sheet with a DraggableScrollableSheet from closing on drag/fling to min extent (#127339)

This PR constrains M3 bottom sheets to 640dp max width by default.
`constraints` can be used to provide different `minWidth` and
`maxWidth`.

This is not a breaking change per the breaking change policy.

Part of https://github.com/flutter/flutter/issues/118619
Part of https://github.com/flutter/flutter/issues/111448

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel
on [Discord].

<!-- Links -->
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[Tree Hygiene]: https://github.com/flutter/flutter/wiki/Tree-hygiene
[test-exempt]:
https://github.com/flutter/flutter/wiki/Tree-hygiene#tests
[Flutter Style Guide]:
https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo
[Features we expect every widget to implement]:
https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo#features-we-expect-every-widget-to-implement
[CLA]: https://cla.developers.google.com/
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[breaking change policy]:
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[Discord]: https://github.com/flutter/flutter/wiki/Chat

* M3 bottomsheet

* Update bottom_sheet.dart

* Update bottom_sheet.dart

* Update bottom_sheet.dart

* Update bottom_sheet.dart

* Update bottom_sheet.dart

* Update bottom_sheet.dart

* Update bottom_sheet.dart

* Update bottom_sheet.dart

* Update bottom_sheet.dart

* Update bottom_sheet.dart

* Update packages/flutter/lib/src/material/bottom_sheet.dart
Co-authored-by: Pierre-Louis <6655696+guidezpl@users.noreply.github.com>

* Update packages/flutter/lib/src/material/bottom_sheet.dart
Co-authored-by: Pierre-Louis <6655696+guidezpl@users.noreply.github.com>

* Update packages/flutter/lib/src/material/bottom_sheet.dart
Co-authored-by: Pierre-Louis <6655696+guidezpl@users.noreply.github.com>

* Update packages/flutter/lib/src/material/bottom_sheet.dart
Co-authored-by: Pierre-Louis <6655696+guidezpl@users.noreply.github.com>

* Update packages/flutter/lib/src/material/bottom_sheet.dart
Co-authored-by: Pierre-Louis <6655696+guidezpl@users.noreply.github.com>

* Update packages/flutter/lib/src/material/bottom_sheet.dart
Co-authored-by: Pierre-Louis <6655696+guidezpl@users.noreply.github.com>

* Update bottom_sheet.dart

Update bottom_sheet_test.dart

Update bottom_sheet.dart

* showDragHandle defaults to false

* fix test

---------
Co-authored-by: Pierre-Louis <6655696+guidezpl@users.noreply.github.com>

Cleanup M3 token templates for theme lookups

Update Material tokens to 0.162

ModalBottomSheetRoute: Remove gap at screen bottom with `useSafeArea: true`

* add shadowColor property

* add to bottom app bar

* add test

* update m2/m3 diffs

* reorder debug test

* finalize

* remove crswap

* update doc comments

* add m2 shadow back

* add const

* update docs

* update docs

* comment replies

* make param non-null

* indentation fix

* doc fix

Remove accessibleNavigation reference from BottomSheet

This reverts commit 0a97ef85.

* remove m3 shadows

* fix

* fix that test over there

* Update to v0.158 of the token database.

* Update checkbox template

* Fix DatePickerTheme test

---------
Co-authored-by: Qun Cheng <quncheng@google.com>

* dart fix --apply

* manual fixes

* Updated to tokens v0.150.

* Updated with a reverted list_tile.dart.

* Implemented Scrim Focus for BottomSheet so that assistive technology users can focus and tap on the scrim to close the BottomSheet, which they could not do before the change . The Scrim Focus's size changes to avoid overlapping the BottomSheet.

fix title

Co-authored-by: Bruno Leroux <bruno.leroux@gmail.com>

* Use `curly_braces_in_flow_control_structures` for `material`

* include test/material

* add back removed comments