Glean-parser

- Transform generated folder into QML Module when building Javascript templates for the Qt platform. ([bug 1707896](https://bugzilla.mozilla.org/show_bug.cgi?id=1707896)
- Import the Glean QML module from inside each generated file, removing the requirement to import Glean before importing any of the generated files;
- Prodive a `qmldir` file exposing all generated files;
- Drop the `namespace` option for Javascript templates;
- Add a new `version` option for Javascript templates, required when building for Qt, which expected the Glean QML module version.

- Add missing import for Kotlin code ([339](https://github.com/mozilla/glean_parser/pull/339))
- Use a plain Kotlin type in the generated interface implementation ([339](https://github.com/mozilla/glean_parser/pull/339))
- Generate additional generics for event metrics ([339](https://github.com/mozilla/glean_parser/pull/339))
- For Kotlin skip generating `GleanBuildInfo.kt` when requested (with `with_buildinfo=false`) ([341](https://github.com/mozilla/glean_parser/pull/341))

- Fix another bug in the Swift code generation when generating extra keys ([334](https://github.com/mozilla/glean_parser/pull/334))

- Fix Swift code generation bug for pings ([333](https://github.com/mozilla/glean_parser/pull/333))

- Generate new event API construct ([321](https://github.com/mozilla/glean_parser/pull/321))

- Add option to add extra introductory text to generated markdown ([298](https://github.com/mozilla/glean_parser/pull/298))
- Add support for Qt in Javascript templates ([bug 1706252](https://bugzilla.mozilla.org/show_bug.cgi?id=1706252))
- Javascript templates will now accept the `platform` option. If this option is set to `qt`
the generated templates will be Qt compatible. Default value is `webext`.