Add Controller::watches_stream and Controller::for_stream

[clux]

Would you like to work on this feature?

Yes

What problem are you trying to solve?

Allow for stream sharing (#1080) of watched and root streams between controllers.
We can follow the approach in #1173 in general, but may have to slightly tweak the new interfaces based on new inputs that are needed.

Describe the solution you'd like

Add

• Controller::watches_stream and Controller::watches_stream_with
• Controller::for_stream that allows passing in the root stream (stream analogue of Controller::new) - Add Controller::for_stream + Controller::watches_stream #1187

Documentation, Adoption, Migration Strategy

Unstable feature. Can probably even consolidate the stream sharing features since the proposed Controller:: methods + the ones done in #1173 would be basically fully analogous.

Target crate for feature

kube-runtime

Related

The following issues can be closed after this as a result (given predicates exist):

• controller should debounce reconcile requests #318
• Controller<T> event duplication #279