By @Ayanda-D: Multiple channel interceptors, with a core team follow-up (backport #17182)

[mergify]

This is #16046 by @Ayanda-D and other contributors, plus a few tweaks from me, mostly around naming, test coverage and edge case handling.

Backporting

Backport PR must wait for the 4.3.5 release to ship first.

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This is an automatic backport of pull request #17182 done by Mergify.

[mergify]

Cherry-pick of d500ce1 has failed:

On branch mergify/bp/v4.3.x/pr-17182
Your branch is ahead of 'origin/v4.3.x' by 2 commits.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit d500ce152a.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	new file:   deps/rabbit/test/dummy_interceptor_priority_1.erl
	new file:   deps/rabbit/test/dummy_interceptor_priority_1_conflict.erl
	new file:   deps/rabbit/test/dummy_interceptor_priority_2.erl
	new file:   deps/rabbit/test/dummy_interceptor_priority_3.erl

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   deps/rabbit/test/channel_interceptor_SUITE.erl

Cherry-pick of b29b6e6 has failed:

On branch mergify/bp/v4.3.x/pr-17182
Your branch is ahead of 'origin/v4.3.x' by 17 commits.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit b29b6e6dd2.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   deps/rabbit/priv/schema/rabbit.schema
	modified:   deps/rabbit/src/rabbit_channel_interceptor.erl
	modified:   deps/rabbit/test/config_schema_SUITE_data/rabbit.snippets
	modified:   deps/rabbitmq_cli/lib/rabbitmq/cli/ctl/commands/set_channel_interceptor_priorities_command.ex

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   deps/rabbit/test/channel_interceptor_SUITE.erl

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[mergify]

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