[lib] Check ID conflicts when processing operations

Summary:
We should check whether an entity with the same ID exists and discard an operation in a case of conflict

https://linear.app/comm/issue/ENG-9190/alternative-solution-update-canbeprocessed-functions

Test Plan:
Tested some scenarios:

1. Repeated text message with the same ID
2. Creating sidebars with
   1. the same thread ID
   2. the same sidebar source message ID
   3. the same create sidebar message ID
3. Repeated changing thread settings with the same message ID prefix

Reviewers: kamil, will

Reviewed By: kamil

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D13464