Define compatibility policy for Go libs

[bobcatfish]

Expected Behavior

We try to minimize the impact of changes to our Go libs on other projects that are using them, for example in #2717 (comment) when @pritidesai noted the impact of that change on the CLI.

It would make sense to have a clear policy around:

• How to make backwards incompatible changes to the libs and what expectations should be around this for users of the libs
• What is and is not part of the lib (people can currently import anything from tektoncd/pipeline except the builders in internal)

Actual Behavior

We have our API compatibility policy outlined in https://github.com/tektoncd/pipeline/blob/master/api_compatibility_policy.md but it does not currently include our client libs.

Additional Info

If we can identify which parts of the code we think it is reasonable for folks to import and use as libs, we can move the rest into internal and that would make it very clear which code you can change without impacting other projects.

[tekton-robot]

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[tekton-robot]

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[tekton-robot]

@tekton-robot: Closing this issue.

In response to this:

Rotten issues close after 30d of inactivity.
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/close

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[vdemeester]

/remove-lifecycle rotten
/remove-lifecycle stale
/reopen

[tekton-robot]

@vdemeester: Reopened this issue.

In response to this:

/remove-lifecycle rotten
/remove-lifecycle stale
/reopen

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[tekton-robot]

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Mark the issue as fresh with /remove-lifecycle stale.
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/lifecycle stale

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