This internally changes the id getter on the
`MetricType` to read from the store in case
of dyanmic labels, as done in the Glean SDK.
This is required in order to attempt recording to
Glean metrics before it gets initialized.

This supports string, boolean and counter labeled
types and ports over tests from the Kotlin implementation
in the SDK and the glean-core internals.

Add labeled metric types

This exposes a "glean" command to be used as an
interface for running the glean_parser by glean.js
consuming products. It takes care of setting up a
virtual environment and making sure that the parser
and its dependencies are up to date.

Bug 1698874 - Sever the circular dependencies in the database

Expose a "glean" command

# Conflicts:
#	CHANGELOG.md
#	glean/package-lock.json
#	glean/package.json
#	glean/src/core/constants.ts