Add Kernel selection picker for local and remote sessions

[DonJayamanne]

For #8612

• Add kernel selection picker for local and remote sessions
• Picker is not integrated with Extension
• Droppdown labels will need to be fixed
• Submitting PR with smaller set of changes, next PR will integrate this with DS code and fix the UI where necessary. (next PR is expected to be fairly large due to integration and minor refactorings)

[codecov-io]

Codecov Report

Merging #8873 into master will increase coverage by 0.09%.
The diff coverage is 85.86%.

@@            Coverage Diff             @@
##           master    #8873      +/-   ##
==========================================
+ Coverage   57.95%   58.05%   +0.09%     
==========================================
  Files         527      529       +2     
  Lines       27526    27612      +86     
  Branches     4146     4158      +12     
==========================================
+ Hits        15954    16029      +75     
- Misses      10695    10701       +6     
- Partials      877      882       +5

Impacted Files	Coverage Δ
src/client/datascience/serviceRegistry.ts	0% <0%> (ø)	⬆️
...lient/datascience/jupyter/kernels/kernelService.ts	60.3% <66.66%> (ø)	⬆️
...ient/datascience/jupyter/kernels/kernelSelector.ts	82.97% <82.97%> (ø)
...nt/datascience/jupyter/kernels/kernelSelections.ts	97.29% <97.29%> (ø)

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[IanMatthewHuff]

[rchiodo]

🕐

[rchiodo]