[ENH] Implement compactor server interface

[Sicheng-Pan]

Description of changes

Summarize the changes made by this PR.

• Improvements & Bug fixes
  • N/A
• New functionality
  • We would like to manually start a compaction on certain collections. This PR is the first in the stack to implement this feature. Specifically, it:
    • Introduces the grpc interface for compactor. Currently there is only a single variant of request that allows the user to specify an optional list of collection ids for compaction.
    • Implements the CompactionServer struct in rust that implements this interface. It receives the request and send it to the running CompactionManager
    • The next PRs will handle the request in CompactionManager.

Test plan

How are these changes tested?

• [ ] Tests pass locally with pytest for python, yarn test for js, cargo test for rust

Documentation Changes

Are all docstrings for user-facing APIs updated if required? Do we need to make documentation changes in the docs repository?