Migrate instrumentation and disro to contrib

[owais]

Description

Now that SDK does not depend on opentelemetry-instrumentation anymore and opentelemetry-instrumentation has actual build time dependencies on the contrib repo, it makes maintanence a lot easier if we move opentelemetry-instrumentation to contrib repo. opentelemetry-distro depends on opentelemetry-instrumentation and is being moved as well. Neither of the two packages are really part of "core" Otel python anyway.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Existing tests

Does This PR Require a Contrib Repo Change?

• Yes. - Link to PR: Migrate instrumentation and distro packages to contrib opentelemetry-python-contrib#738
• No.

Checklist:

• Followed the style guidelines of this project
• Changelogs have been updated
• Unit tests have been added
• Documentation has been updated

[ocelotl]

I am ok with this since it makes maintenance easier, nevertheless:

1. I feel like maintenance should not be hard in the first place, looks like we could benefit from a way of installation of packages that is not made harder or easier depending on where the code of that package is.
2. We need to write down the criteria that decides what goes into the core repo and what goes into contrib.
3. I would expect at least opentelemetry-instrumentation to go back to the core repo sooner than later, instrumentation is at least mentionedhere.

[lzchen]

N I C E