This auto-formats all *.dart files in the repository outside of the
`engine` subdirectory and enforces that these files stay formatted with
a presubmit check.
**Reviewers:** Please carefully review all the commits except for the
one titled "formatted". The "formatted" commit was auto-generated by
running `dev/tools/format.sh -a -f`. The other commits were hand-crafted
to prepare the repo for the formatting change. I recommend reviewing the
commits one-by-one via the "Commits" tab and avoiding Github's "Files
changed" tab as it will likely slow down your browser because of the
size of this PR.
---------
Co-authored-by: Kate Lovett <katelovett@google.com>
Co-authored-by: LongCatIsLooong <31859944+LongCatIsLooong@users.noreply.github.com>
Otherwise I get the following failure on CI:
```txt
packages/flutter_driver/lib/src/native/android.dart:123: Found "```" in code but it did not match RegExp: pattern=^ */// *```dart$ flags= so something is wrong. Line was: " /// ```sh"
Found 1 snippet code errors.
See the documentation at the top of dev/bots/analyze_snippet_code.dart for details.
```
It seems reasonable to put a reference to a shell command in a Dartdoc
comment.
This PR is step 12 in the journey to solve issue #136139 and make the
entire Flutter repo more readable.
Most of it involves implementing switch expressions, and there's also a
few other random things that I wanted to clean up a bit.
