v4.4.0

• Support global file-level tags in metrics.yaml (bug 1745283)

• Glinter: Reject metric files if they use unit by mistake. It should be time_unit (#432).

• Automatically generate a build date when generating build info (#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