[Instrumentation.AspNetCore] Use static Meter and Histogram

[utpilla]

Towards #4376

Changes

• Use static Meter and Histogram
• This should allow for multiple SDK registrations with instrumentation so that they can be disposed without affect each other.(This is also consistent with how we have defined ActivitySource and Meter for Http instrumentation)

[CodeBlanch]

LGTM

[codecov]

Codecov Report

Merging #5112 (c6acb9e) into main (c5f5dd7) will increase coverage by 0.08%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5112      +/-   ##
==========================================
+ Coverage   83.00%   83.09%   +0.08%     
==========================================
  Files         296      296              
  Lines       12322    12320       -2     
==========================================
+ Hits        10228    10237       +9     
+ Misses       2094     2083      -11     

Flag	Coverage Δ
unittests	83.09% <100.00%> (+0.08%)	⬆️

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

Files	Coverage Δ
...ry.Instrumentation.AspNetCore/AspNetCoreMetrics.cs	100.00% <100.00%> (ø)
...AspNetCore/Implementation/HttpInMetricsListener.cs	89.47% <100.00%> (+0.90%)	⬆️
...ation.AspNetCore/MeterProviderBuilderExtensions.cs	100.00% <100.00%> (ø)

... and 7 files with indirect coverage changes