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>
Useful in tooling, releases, etc - where Dart is available
Example usages:
```bash
# Monorepo world
❯ dart ./dev/tools/bin/engine_hash.dart -s head
226e13826c7253c968d798666f323b1f207979f8
# Non-monorepo world
❯ dart ./dev/tools/bin/engine_hash.dart -s head
Error calculating engine hash: Not in a monorepo
```
