Glean-parser

- Add Ruby log outputter (`ruby_server`) ([620](https://github.com/mozilla/glean_parser/pull/620))
- BREAKING CHANE: `ping` lifetime metrics on the events ping are now disallowed ([625](https://github.com/mozilla/glean_parser/pull/625))
- Disallow `unit` field for anything but quantity ([630](https://github.com/mozilla/glean_parser/pull/630)).
Note that this was already considered the case, now the code enforces it.

- BREAKING CHANGE: Dropped support for Python 3.6 ([615](https://github.com/mozilla/glean_parser/issues/615))
- Allow metadata to configure precise timestamps in pings ([592](https://github.com/mozilla/glean_parser/pull/592))

- Small updates to the `javascript_server` tempalte to address lint warnings ([598](https://github.com/mozilla/glean_parser/pull/598))

- Increased the maximum metric name length in version 2.0.0 schema ([596](https://github.com/mozilla/glean_parser/pull/596))

- BREAKING CHANGE: Remove exposed `lint_yaml_files` function ([580](https://github.com/mozilla/glean_parser/pull/580))
- Rust: Removed `__glean_metric_maps` from the Rust Jinja template. This functionality is better placed downstream ([Bug 1816526](https://bugzilla.mozilla.org/show_bug.cgi?id=1816526))
- New lint: check that all referenced pings are known ([584](https://github.com/mozilla/glean_parser/pull/584))
- Add experimental server-side JavaScript outputter ([FXA-7922](https://mozilla-hub.atlassian.net/browse/FXA-7922))

- Unbreak last minor release ([579](https://github.com/mozilla/glean_parser/pull/579))