feat: tx error producer

[Lodek]

What:

This PR introduces a new utility which listens to Tx events published by SourceHub and relays them to Source's event queue (kafka).

Why:
SourceHub txs are executed upon block proposal as part of ABCI.
As consequence, tx errors are not written to the usual log stream, it's possible to recover these messages by setting error log to debug, but far too much noise comes along with it.
Furthermore, there are advantages to separating operational logs to application logs.
This approach solves these problems by directly extracting the logs from CometBFT events and writes it to a readily accessible event infrastructure which can be used to explore errors.

[iverc]

I think we might wanna have a separate dockerfile for the tx listener

[Lodek]

I think you're right. After double checking the binary size, it's surprisingly large (140M). I'll revise that

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 1.47059% with 201 lines in your changes missing coverage. Please review.

Project coverage is 44.70%. Comparing base (868cca4) to head (378c982).
Report is 2 commits behind head on dev.

Files with missing lines	Patch %	Lines
cmd/tx_err_producer/main.go	0.00%	172 Missing ⚠️
sdk/listener.go	11.11%	24 Missing ⚠️
cmd/tx_listener/main.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev      #51      +/-   ##
==========================================
- Coverage   45.06%   44.70%   -0.36%     
==========================================
  Files         221      222       +1     
  Lines       13293    13474     +181     
==========================================
+ Hits         5990     6024      +34     
- Misses       6847     6992     +145     
- Partials      456      458       +2     

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