Move non-core instrumentations/exporters/propagators out of main repo

[codeboten]

As per discussion in the SIG meetings, we want to move all non-core instrumentations/exporters and propagators out of this repo and into the opentelemetry-python-contrib repo.

Benefits

• less area to cover in the core repo
• accelerate merging of third-party instrumentations/exporters/propagators

Goals

• CI pipeline somehow must remain sane: validation that PRs in either repo isn't breaking the other repo
  if a new release of otel-py is out, the contrib repo should be updated
• maintain contributors history
• releasing package in contrib should be easier: currently every package depends on all the other ones being released, this means releases are slower
• identify maintainers/approvers
• determine the guidelines for approving/merging/releasing

[NathanielRN]

Thanks for writing this up, @codeboten! Looking forward to helping 👍

[Oberon00]

I just noticed running python scripts/eachdist.py lint takes extremely long (6 minutes on my rather fast 12 logical core notbook, using all cores) because pylint is not exactly fast. There are lots of packages and I think there is no ready-made support to exclude something from the script.

[codeboten]

Closing this for now. Thanks for all the work @NathanielRN!