[chore] extension/observer: move Endpoints{Lister,Watcher} to a new package #38416
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Description
Move EndpointsLister and EndpointsWatcher to a new "endpointswatcher" package. The intention here is to more clearly delineates the public API of the observer package -- the bits inside endpointswatcher are intended only for implementations of observers. See #38412 (comment) and #38412 (comment) for further motivation.
I've made the new package non-internal in case there are any observer implementations out of tree.
Link to tracking issue
N/A
Testing
Ran/updated unit tests
Documentation
N/A except for adding package doc explaining that endpointswatcher is intended for implementations only.