Glean-parser

- BUGFIX: Revert changes made on v5.1.1.
- The issues addressed by those changes, were non-issues and result of misuse of the APIs.

- BUGFIX: Fix issues with Swift templates ([bug 1749494](https://bugzilla.mozilla.org/show_bug.cgi?id=1749494))
- Make metrics and pings all `public`
- Make pings `static`

- Add support for build info generation for JavaScript and Typescript targets ([bug 1749494](https://bugzilla.mozilla.org/show_bug.cgi?id=1749494))

- Fix the logic for the metric expiration by version ([bug 1753194](https://bugzilla.mozilla.org/show_bug.cgi?id=1753194))

- Remove C support ([436](https://github.com/mozilla/glean_parser/pull/436)).
- Add support for Rust code generation ([bug 1677434](https://bugzilla.mozilla.org/show_bug.cgi?id=1677434))
- Report an error if no files are passed ([bug 1751730](https://bugzilla.mozilla.org/show_bug.cgi?id=1751730))
- [data-review] Report an error if no metrics match provided bug number ([bug 1752576](https://bugzilla.mozilla.org/show_bug.cgi?id=1752576))
- [data-review] Include notification_emails in list of those responsible ([bug 1752576](https://bugzilla.mozilla.org/show_bug.cgi?id=1752576))
- Add support for expiring metrics by the provided major version ([bug 1753194](https://bugzilla.mozilla.org/show_bug.cgi?id=1753194))

- Support global file-level tags in metrics.yaml ([bug 1745283](https://bugzilla.mozilla.org/show_bug.cgi?id=1745283))
- Glinter: Reject metric files if they use `unit` by mistake. It should be `time_unit` ([432](https://github.com/mozilla/glean_parser/pull/432)).
- Automatically generate a build date when generating build info ([431](https://github.com/mozilla/glean_parser/pull/431)).
Enabled for Kotlin and Swift.
This can be changed with the `build_date` command line option.
`build_date=0` will use a static unix epoch time.
`build_date=2022-01-03T17:30:00` will parse the ISO8601 string to use (as a UTC timestamp).
Other values will throw an error.

Example:

glean_parser translate --format kotlin --option build_date=2021-11-01T01:00:00 path/to/metrics.yaml