[refactor] Move cmd/collector/app/sampling/model types to storage

[ary82]

Which problem is this PR solving?

• Towards Remove OTEL/contrib dependency on cmd/collector/app/sampling #6411

Description of the changes

• Involves refactoring the model package in cmd/collector/app/sampling
• Move specific plugin/storage/cassandra/samplingstore types to that package as internal types
• Move the other types to storage/samplingstore/model

How was this change tested?

• Covered by existing

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: npm run lint and npm run test

[yurishkuro]

lgtm

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.21%. Comparing base (77c5f2a) to head (74c096b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6531   +/-   ##
=======================================
  Coverage   96.21%   96.21%           
=======================================
  Files         372      372           
  Lines       21360    21360           
=======================================
  Hits        20551    20551           
  Misses        616      616           
  Partials      193      193           

Flag	Coverage Δ
badger_v1	10.65% <0.00%> (ø)
badger_v2	2.78% <0.00%> (ø)
cassandra-4.x-v1-manual	16.55% <0.00%> (ø)
cassandra-4.x-v2-auto	2.71% <0.00%> (ø)
cassandra-4.x-v2-manual	2.71% <0.00%> (ø)
cassandra-5.x-v1-manual	16.55% <0.00%> (ø)
cassandra-5.x-v2-auto	2.71% <0.00%> (ø)
cassandra-5.x-v2-manual	2.71% <0.00%> (ø)
elasticsearch-6.x-v1	20.23% <0.00%> (ø)
elasticsearch-7.x-v1	20.30% <0.00%> (ø)
elasticsearch-8.x-v1	20.45% <0.00%> (-0.01%)	⬇️
elasticsearch-8.x-v2	2.78% <0.00%> (+<0.01%)	⬆️
grpc_v1	12.17% <0.00%> (-0.01%)	⬇️
grpc_v2	9.04% <0.00%> (ø)
kafka-3.x-v1	10.34% <0.00%> (ø)
kafka-3.x-v2	2.78% <0.00%> (ø)
memory_v2	2.77% <0.00%> (-0.01%)	⬇️
opensearch-1.x-v1	20.34% <0.00%> (-0.01%)	⬇️
opensearch-2.x-v1	20.35% <0.00%> (ø)
opensearch-2.x-v2	2.77% <0.00%> (-0.11%)	⬇️
tailsampling-processor	0.51% <0.00%> (ø)
unittests	95.09% <100.00%> (ø)

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