feat: Add support for instrumenting OpenSearchClient requests.

[jaffinito]

Description

Refactors Elasticsearch wrapper and adds OpenSearch wrapper. Both share the same base class. More could have been moved to the base class, but that code would not be testable so I left it in the wrappers. Some of the methods in the base could have been made private, but to cover more of the base class in unit tests I made them public. Integration tests are based on the Elasticsearh tests.

Author Checklist

• Unit tests, Integration tests, and Unbounded tests completed
• Performance testing completed with satisfactory results (if required)

Reviewer Checklist

• Perform code review
• Pull request was adequately tested (new/existing tests, performance tests)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.92%. Comparing base (f622a40) to head (18d6435).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2956      +/-   ##
==========================================
+ Coverage   81.80%   81.92%   +0.11%     
==========================================
  Files         470      471       +1     
  Lines       29953    30104     +151     
  Branches     3330     3348      +18     
==========================================
+ Hits        24504    24663     +159     
+ Misses       4657     4648       -9     
- Partials      792      793       +1     

Flag	Coverage Δ
Agent	82.88% <100.00%> (+0.12%)	⬆️
Profiler	73.13% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...ent.Extensions/Helpers/SearchRequestWrapperBase.cs	100.00% <100.00%> (ø)
...ic.Agent.Extensions/Providers/Wrapper/Constants.cs	91.42% <ø> (ø)

... and 4 files with indirect coverage changes