Define a proper deprecation policy for frameworks #4047
Description
Right now, we almost never drop framework support explicitly. We should be more mindful of how and when we drop support for frameworks.
- determine and define minimum versions for all currently integrated frameworks
- the toxgen script can help with this since it automatically determines the lowest supported version using package metadata
- enforce these (from the next major)
- when working on a new major, go through frameworks and see what the new effective minimum version is and update it
- ...and call this out in the release notes
- see Drop support for old versions of frameworks in POTel #4049 for POTel
- be explicit about how this works in our documentation