Separate model parts into more independent pieces

[yurishkuro]

Which problem is this PR solving?

• Part of [jaeger-idl] Copy model/*go to jaeger-idl/model/v1 #6571
• Follow-up to Add model/v1 jaeger-idl#118

Description of the changes

• Separate model files into more independent pieces that are easier to move to jaeger-idl

How was this change tested?

• CI

[yurishkuro]

TODO: this needs to change to a standalone function without receiver: ToOTELSpanID(SpanID).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.21%. Comparing base (976a36e) to head (edaf549).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6581      +/-   ##
==========================================
- Coverage   96.24%   96.21%   -0.03%     
==========================================
  Files         373      375       +2     
  Lines       21389    21389              
==========================================
- Hits        20585    20580       -5     
- Misses        612      616       +4     
- Partials      192      193       +1     

Flag	Coverage Δ
badger_v1	10.65% <31.25%> (ø)
badger_v2	2.78% <37.50%> (ø)
cassandra-4.x-v1-manual	16.61% <43.75%> (ø)
cassandra-4.x-v2-auto	2.71% <37.50%> (ø)
cassandra-4.x-v2-manual	2.71% <37.50%> (ø)
cassandra-5.x-v1-manual	16.61% <43.75%> (ø)
cassandra-5.x-v2-auto	2.71% <37.50%> (ø)
cassandra-5.x-v2-manual	2.71% <37.50%> (ø)
elasticsearch-6.x-v1	20.39% <31.25%> (ø)
elasticsearch-7.x-v1	20.47% <31.25%> (+<0.01%)	⬆️
elasticsearch-8.x-v1	20.62% <31.25%> (-0.01%)	⬇️
elasticsearch-8.x-v2	2.78% <37.50%> (ø)
grpc_v1	12.18% <31.25%> (ø)
grpc_v2	9.03% <37.50%> (ø)
kafka-3.x-v1	10.34% <31.25%> (ø)
kafka-3.x-v2	2.78% <37.50%> (+<0.01%)	⬆️
memory_v2	2.77% <37.50%> (-0.01%)	⬇️
opensearch-1.x-v1	20.52% <31.25%> (+<0.01%)	⬆️
opensearch-2.x-v1	20.51% <31.25%> (-0.01%)	⬇️
opensearch-2.x-v2	2.77% <37.50%> (ø)
tailsampling-processor	0.51% <0.00%> (ø)
unittests	95.07% <100.00%> (-0.03%)	⬇️

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