SDK 2.0 Plan for unstable packages

[dyladan]

The unstable packages will continue to target the released 1.x packages for most of the development cycle. If any experimental package is stabilized during the 2.x development, it will be released as 1.x and moved into the 2.x line at that time.

The one caveat is the OTLP exporters discussed in #4128

When the 2.0 packages are released as release candidate, the unstable packages will be updated to target the 2.x packages. From that time, the experimental packages targeting 1.x will only be updated with bug and security fixes. Any feature added to the experimental features targeting the 1.x line will be expected to be added to the line targeting 2.x first.

[github-actions]

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