Bug fix in pbSerializer and code clean up

[drnushooz]

This PR fixes the buildMessageIndexes function where the indexBuf would not get the result of the loop variable. This also improves the packer_utils to use big endian instead of small to provide consistency throughout the code.

[codecov-commenter]

Codecov Report

Merging #61 (48764fe) into main (9e878e1) will decrease coverage by 0.73%. The diff coverage is 39.28%.

@@            Coverage Diff             @@
##             main      #61      +/-   ##
==========================================
- Coverage   67.93%   67.19%   -0.74%     
==========================================
  Files          27       27              
  Lines        1759     1759              
==========================================
- Hits         1195     1182      -13     
- Misses        437      448      +11     
- Partials      127      129       +2     

Impacted Files	Coverage Δ
server/kafka/partitioner.go	26.92% <0.00%> (-14.26%)	:arrow_down:
server/kafka/packer_utils.go	60.00% <60.00%> (-40.00%)	:arrow_down:
server/kafka/pb_schema_manager.go	69.04% <100.00%> (ø)
server/kafka/pb_serializer.go	64.86% <100.00%> (-0.93%)	:arrow_down:

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[variadico]

I can do a bug fix release, 1.2.1.

[drnushooz]

I can do a bug fix release, 1.2.1.

That sounds great!