Rename extension classes for HttpClient and Asp.Net Core

[vishweshbankwar]

Fixes #
Design discussion issue #

Changes

Renames classes for better support doc generation (docfx).

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 #5161 (ca5b3ac) into main (486ee58) will decrease coverage by 0.03%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5161      +/-   ##
==========================================
- Coverage   83.45%   83.43%   -0.03%     
==========================================
  Files         297      297              
  Lines       12368    12368              
==========================================
- Hits        10322    10319       -3     
- Misses       2046     2049       +3     

Flag	Coverage Δ
unittests	83.43% <ø> (-0.03%)	⬇️

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

Files	Coverage Δ
...reInstrumentationMeterProviderBuilderExtensions.cs	100.00% <ø> (ø)
...eInstrumentationTracerProviderBuilderExtensions.cs	100.00% <ø> (ø)
...ntInstrumentationMeterProviderBuilderExtensions.cs	100.00% <ø> (ø)
...tInstrumentationTracerProviderBuilderExtensions.cs	100.00% <ø> (ø)

... and 6 files with indirect coverage changes

[CodeBlanch]

LGTM