This PR is to add a new page transition for Material 3.
The new builder matches the latest Android page transition behavior;
while the new page slides in from right to left, it fades in at the same
time and the old page slides out from right to left, fading out at the
same time. When both pages are fading in/out, the black background might
show up, so I added a `ColoredBox` for the slides-out page whose color
defaults to `ColorScheme.surface`. The `backgroundColor` property can be
used to customize the default transition color.
This demo shows the forward and backward behaviors.
https://github.com/user-attachments/assets/a806f25d-8564-4cad-8dfc-eb4585294181
Fixes: https://github.com/flutter/flutter/issues/142352
## 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] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.
Updated tests in dev, examples/api, and tests/widgets to ensure that
they continue to pass when the default for `ThemeData.useMaterial3` is
changed to true.
This is the final set of changes required for
https://github.com/flutter/flutter/issues/127064.
