Bruno Leroux 0c724d3579
Add SnackBarTheme (#180001)
## Description

This PR adds the `SnackBarTheme` subclass of InheritedTheme. Similarly
to other theme classes.

Despite missing, this class was mentioned in
[flutter.dev/go/material-theme-system-updates](http://flutter.dev/go/material-theme-system-updates):
"SnackBarTheme and SnackBarThemeData are conformant.. "


## Related Issue
Fixes [Missing
SnackBarTheme](https://github.com/flutter/flutter/issues/180000)

## Tests

Adds 2 tests.
2025-12-23 08:47:20 +00:00
..
2025-12-23 08:47:20 +00:00
2025-12-23 08:47:20 +00:00

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