[CON-89] Increase tm event buffer to reduce critical path backpressure

[udpatil]

Describe your changes and provide context

Currently, the buffer for tendermint events is too small to properly handle large amounts of traffic, since filling the buffer up will slow down the critical path for execution, resulting in potentially longer block times or at least node falling behind.

Testing performed to validate your change

Tested in loadtest cluster and detacehd pacific-1 RPC

[masih]

Port-over of sei-protocol/sei-tendermint#329

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 27.10%. Comparing base (4066587) to head (953a32f).
⚠️ Report is 1 commits behind head on main.

❌ Your project status has failed because the head coverage (27.10%) is below the target coverage (60.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2428       +/-   ##
===========================================
- Coverage   46.71%   27.10%   -19.61%     
===========================================
  Files         409     1464     +1055     
  Lines       39714   144402   +104688     
===========================================
+ Hits        18551    39142    +20591     
- Misses      19873   101900    +82027     
- Partials     1290     3360     +2070     

Files with missing lines	Coverage Δ
sei-tendermint/internal/eventbus/event_bus.go	0.00% <ø> (ø)

... and 1202 files with indirect coverage changes

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