[es] Refactor the ES SpanWriter to make it reusable for v2 APIs

[Manik2708]

Which problem is this PR solving?

Fixes a part of #6458

Description of the changes

• The JsonSpanWriter accepts the json span instead of jaeger span which makes it reusabe in v2 storage APIs

How was this change tested?

• Unit Tests

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

[Manik2708]

@mahadzaryab1 @yurishkuro I am bit confused for the directory structure of model. I have kept it in pkg/es, should I create a new package inside pkg/es for it?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.04%. Comparing base (2c5cdc9) to head (fdb4ced).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6796   +/-   ##
=======================================
  Coverage   96.03%   96.04%           
=======================================
  Files         364      364           
  Lines       20702    20712   +10     
=======================================
+ Hits        19882    19892   +10     
  Misses        626      626           
  Partials      194      194           

Flag	Coverage Δ
badger_v1	9.86% <0.00%> (-0.01%)	⬇️
badger_v2	1.98% <0.00%> (-0.01%)	⬇️
cassandra-4.x-v1-manual	14.87% <0.00%> (-0.02%)	⬇️
cassandra-4.x-v2-auto	1.97% <0.00%> (-0.01%)	⬇️
cassandra-4.x-v2-manual	1.97% <0.00%> (-0.01%)	⬇️
cassandra-5.x-v1-manual	14.87% <0.00%> (-0.02%)	⬇️
cassandra-5.x-v2-auto	1.97% <0.00%> (-0.01%)	⬇️
cassandra-5.x-v2-manual	1.97% <0.00%> (-0.01%)	⬇️
elasticsearch-6.x-v1	19.26% <87.50%> (+0.06%)	⬆️
elasticsearch-7.x-v1	19.34% <87.50%> (+0.06%)	⬆️
elasticsearch-8.x-v1	19.51% <87.50%> (+0.06%)	⬆️
elasticsearch-8.x-v2	1.98% <0.00%> (-0.01%)	⬇️
grpc_v1	10.90% <0.00%> (-0.02%)	⬇️
grpc_v2	7.95% <0.00%> (-0.01%)	⬇️
kafka-3.x-v1	10.16% <0.00%> (-0.02%)	⬇️
kafka-3.x-v2	1.98% <0.00%> (-0.01%)	⬇️
memory_v2	1.98% <0.00%> (-0.01%)	⬇️
opensearch-1.x-v1	19.39% <87.50%> (+0.06%)	⬆️
opensearch-2.x-v1	19.39% <87.50%> (+0.06%)	⬆️
opensearch-2.x-v2	1.98% <0.00%> (-0.01%)	⬇️
tailsampling-processor	0.48% <0.00%> (-0.01%)	⬇️
unittests	94.93% <100.00%> (+<0.01%)	⬆️

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[Manik2708]

@yurishkuro I have refactored with the way you said. Please review, once the apporach here is approved, same will be repeated for reader. But one thing which I want to ask is should we include CreateTemplates in JsonSpanWriter also? As it will also be needed in v2 APIs.

[Manik2708]

@yurishkuro Does the new changes make sense?

[yurishkuro]

lgtm