refactor: improve pyroscope data format (#596)

* feat: improve pyroscope data format.

Current data format used for rendering is not defined formally and has
a couple of issues:
- There's no format versioning, which makes it hard to evolve the
format or migrate between versions.
- Current format has redudancy, with duplicated metadata.

This may become a problem especially once adhoc mode is released, as
this format is directly exported to JSON.

I have created a new package with the flamebearer profile versioned
model, which should make the format more explicit and easier to
evolve. I have also removed the duplicated metadata.

* chore: disable linter error.

* chore: include JavaScript linter fixes.

* Add a version field to the flamebearer model.

* Add version to flamebearer test fixtures.

* Add more missing version fields.