Add generic item support for queue

[haarisr]

Why are these changes needed?

Add generic support for queue. This allows the queue to be templated over any type allowing for type checkers to work better.

Checks

• [x] I've signed off every commit(by using the -s flag, i.e., git commit -s) in this PR.
• [x] I've run scripts/format.sh to lint the changes in this PR.
• [ ] I've included any doc changes needed for https://docs.ray.io/en/master/.
  • [ ] I've added any new APIs to the API Reference. For example, if I added a method in Tune, I've added it in doc/source/tune/api/ under the corresponding .rst file.
• [ ] I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/
• Testing Strategy
  • [ ] Unit tests
  • [ ] Release tests
  • [x] This PR is not tested :(

[rkooo567]

also there are some unit tests failures

[haarisr]

The error has something to do with the docs not building.

Unfortunately I'm not super familiar with readthedocs, it's something to do with generic types.

ray/python/ray/util/queue.py:docstring of ray.util.queue.Queue:1: WARNING: py:obj reference target not found: ray.util.queue.T

[rkooo567]

can you first try adding a unit test? If it still fails, I can help resolving this

[haarisr]

can you first try adding a unit test? If it still fails, I can help resolving this

Hi bumping this

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[edoakes]

stale; @haarisr please re-open if you are still interested in contributing this!