Cleanup ResiliencePipelineRegistry internals

[martintmk]

Details on the issue fix or feature implementation

• ConfigureBuilderContext should not be cached, instead re-created per each call.
• Moved PipelineComponent construction to a separate class.

No public changes.

Confirm the following

• I started this PR by branching from the head of the default branch
• I have targeted the PR to merge into the default branch
• I have included unit tests for the issue/feature
• I have successfully run a local build

[codecov]

Codecov Report

Merging #1510 (4079573) into main (a61b343) will increase coverage by 0.07%.
Report is 2 commits behind head on main.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1510      +/-   ##
==========================================
+ Coverage   83.86%   83.93%   +0.07%     
==========================================
  Files         272      274       +2     
  Lines        6481     6511      +30     
  Branches     1020     1018       -2     
==========================================
+ Hits         5435     5465      +30     
  Misses        837      837              
  Partials      209      209              

Flag	Coverage Δ
linux	83.93% <100.00%> (+0.07%)	⬆️
macos	83.93% <100.00%> (+0.07%)	⬆️
windows	83.93% <100.00%> (+0.07%)	⬆️

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

Files Changed	Coverage Δ
....Core/Registry/RegistryPipelineComponentBuilder.cs	100.00% <100.00%> (ø)
...ore/Registry/ResiliencePipelineRegistry.TResult.cs	100.00% <100.00%> (ø)
.../Polly.Core/Registry/ResiliencePipelineRegistry.cs	100.00% <100.00%> (ø)

... and 7 files with indirect coverage changes