Rename Processor to PostAggregator

[Pushkarm029]

Which problem is this PR solving?

• Refactor Adaptive Sampling Aggregator & Strategy Store #5441 (comment)

Description of the changes

• Rename Processor to PostAggregator

How was this change tested?

• make test

Checklist

• I have read https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
• I have signed all commits
• I have added unit tests for the new functionality
• I have run lint and test steps successfully
  • for jaeger: make lint test
  • for jaeger-ui: yarn lint and yarn test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.52%. Comparing base (901165c) to head (6101610).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5479   +/-   ##
=======================================
  Coverage   95.52%   95.52%           
=======================================
  Files         331      331           
  Lines       16155    16155           
=======================================
  Hits        15432    15432           
  Misses        548      548           
  Partials      175      175           

Flag	Coverage Δ
badger_v1	8.05% <ø> (ø)
badger_v2	1.93% <ø> (ø)
cassandra-3.x-v1	16.43% <ø> (ø)
cassandra-3.x-v2	1.85% <ø> (ø)
cassandra-4.x-v1	16.43% <ø> (ø)
cassandra-4.x-v2	1.85% <ø> (ø)
elasticsearch-7.x	1.78% <ø> (ø)
elasticsearch-8.x	1.78% <ø> (+0.01%)	⬆️
grpc_v1	9.51% <ø> (-0.02%)	⬇️
grpc_v2	7.58% <ø> (ø)
kafka	9.78% <ø> (ø)
opensearch-1.x	1.76% <ø> (ø)
opensearch-2.x	1.78% <ø> (ø)
unittests	93.92% <100.00%> (ø)

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