## 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">

Remove 1745 decorative breaks

Update Material tokens to 0.162

* 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.

Refactor gen_defaults to support multiple generated code blocks in the same file independently. (#107278)

* Improve `useMaterial3` documentation

* reverse styles and components

* tweak language around support

* Update theme_data.dart

* remove trailing space

* Update packages/flutter/lib/src/material/theme_data.dart
Co-authored-by: Darren Austin <darren@darrenaustin.org>

* add missing spec links

* remove spec links from useMaterial3

* move defaults section up, rejig things

* spaces no longer trailing

* spaces no longer trailing (2)
Co-authored-by: Darren Austin <darren@darrenaustin.org>

* Use `curly_braces_in_flow_control_structures` for `material`

* include test/material

* add back removed comments

Also added the Card tokens to the exported list.

* migrates lib/foundation and lib/widgets

* migrates lib/painting and lib/material

* migrates lib/cupertino, lib/gestures, lib/services, lib/semantics and lib/rendering

* fixes failing tests

* migrates test/

* improves hashing of lists

Added the navigation_rail.json as well.

This reverts commit 5fd259be.

macOS was sharing the iOS font theme, but the names of the underlying
fonts differ between the two platforms, so this was actually using the
fallback font from the engine. Instead of using the underlying font
names on macOS, which is no longer allowed by CoreText, use the
meta-font returned by systemFontOfSize:

This has been verified on 10.15; older versions of macOS may need
different font names as the handling of these fonts have changed over
time. Fixing older versions as necessary will be handled in a follow-up.

See https://github.com/flutter/flutter/issues/57805