## Description

This PR fixes changes how `InkWell` reacts to keyboard activation. 

**Before**: the activation started a splash and immediately terminated it which did not let time for widgets that resolve material state properties to react (visually it also mean the splash does not have time to expand).

**After**: the activation starts and terminates after a delay (I arbitrary choose 200ms for the moment).

## Related Issue

Fixes https://github.com/flutter/flutter/issues/132377.

## Tests

Adds one test.