Rename HttpClientInstrumentationOptions

[vishweshbankwar]

Fixes #
Design discussion issue #

Changes

Renaming the class to make the intent more clear. It keeps the option to introduce metric options separately in future (if needed).

Merge requirement checklist

• CONTRIBUTING guidelines followed (nullable enabled, static analysis, etc.)
• Unit tests added/updated
• Appropriate CHANGELOG.md files updated for non-trivial changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

Merging #5109 (28d78b9) into main (f592dcf) will decrease coverage by 0.01%.
Report is 1 commits behind head on main.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5109      +/-   ##
==========================================
- Coverage   83.10%   83.09%   -0.01%     
==========================================
  Files         296      296              
  Lines       12318    12318              
==========================================
- Hits        10237    10236       -1     
- Misses       2081     2082       +1     

Flag	Coverage Δ
unittests	83.09% <100.00%> (-0.01%)	⬇️

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

Files	Coverage Δ
....Instrumentation.Http/HttpClientInstrumentation.cs	100.00% <100.00%> (ø)
...tion.Http/HttpClientTraceInstrumentationOptions.cs	100.00% <ø> (ø)
...tp/Implementation/HttpHandlerDiagnosticListener.cs	71.75% <ø> (ø)
...plementation/HttpWebRequestActivitySource.netfx.cs	82.15% <100.00%> (ø)
...umentation.Http/TracerProviderBuilderExtensions.cs	100.00% <100.00%> (ø)

... and 6 files with indirect coverage changes