feat: message reactions

[ricardogarim]

As per FDR-61, this PR adds support for reactions with four testable use cases:

1. set message reaction from the Rocket.Chat side
2. unset message reaction from the Rocket.Chat side
3. receive a reaction from a matrix node
4. receive an unset reaction from a matrix node

must be tested alongside: RocketChat/Rocket.Chat#36420.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 11.18881% with 127 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.10%. Comparing base (9595ed8) to head (b7b3e2f).

Files with missing lines	Patch %	Lines
packages/room/src/manager/factory.ts	2.85%	68 Missing ⚠️
...ederation-sdk/src/services/staging-area.service.ts	5.71%	33 Missing ⚠️
...es/federation-sdk/src/queues/staging-area.queue.ts	10.52%	17 Missing ⚠️
.../federation-sdk/src/services/federation.service.ts	0.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #79      +/-   ##
==========================================
- Coverage   49.67%   49.10%   -0.58%     
==========================================
  Files          76       76              
  Lines        8457     8578     +121     
==========================================
+ Hits         4201     4212      +11     
- Misses       4256     4366     +110     

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