feat(drive-abci): preliminary support for event subscriptions in Platform

[lklimek]

Issue being fixed or feature implemented

We want users to subscribe to events, like document deleted.

What was done?

Added some infrastructure to subscribe to events and notify subscribers about events to all layers except DAPI.

DAPI part will be done in separate PR #2716

How Has This Been Tested?

Breaking Changes

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• I have made corresponding changes to the documentation if needed

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone

[coderabbitai]

Important

Review skipped

Draft detected.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/drive-event-bus

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[github-actions]

❌ gRPC Query Coverage Report

================================================================================
gRPC Query Coverage Report - NEW QUERIES ONLY
================================================================================

Total queries in proto: 48
Previously known queries: 47
New queries found: 1

================================================================================

New Query Implementation Status:
--------------------------------------------------------------------------------
✗ subscribePlatformEvents                       NOT FOUND

================================================================================
Summary:
--------------------------------------------------------------------------------
New queries implemented: 0 (0.0%)
New queries missing: 1 (100.0%)

Total known queries: 48
  - Implemented: 44
  - Not implemented: 3
  - Excluded: 1

Not implemented queries:
  - getConsensusParams
  - getTokenPreProgrammedDistributions
  - subscribePlatformEvents

Missing NEW queries:
  - subscribePlatformEvents

[lklimek]

@coderabbitai review all

[coderabbitai]

@lklimek: I'll perform a comprehensive review of all the changes in this PR.

✅ Actions performed

Full review triggered.