extension activation and context registration

[rebornix]

Re #10152

Group extension activation and context update related code into sub folders

• Pull request represents a single change (i.e. not fixing disparate/unrelated things in a single PR).
• Title summarizes what is changing.
• Has a news entry file (remember to thank yourself!).
• Appropriate comments and documentation strings in the code.
• Has sufficient logging.
• Has telemetry for feature-requests.
• Unit tests & system/integration tests are added/updated.
• Test plan is updated as appropriate.
• package-lock.json has been regenerated by running npm install (if dependencies have changed).

[codecov-commenter]

Codecov Report

Merging #10520 (edf006d) into main (669d502) will decrease coverage by 0%.
The diff coverage is 100%.

@@          Coverage Diff           @@
##            main   #10520   +/-   ##
======================================
- Coverage     71%      71%   -1%     
======================================
  Files        468      468           
  Lines      28103    28071   -32     
  Branches    4747     4742    -5     
======================================
- Hits       19976    19948   -28     
+ Misses      6247     6240    -7     
- Partials    1880     1883    +3     

Impacted Files	Coverage Δ
src/kernels/installer/productInstaller.node.ts	74% <ø> (+12%)	⬆️
src/platform/activation/types.ts	100% <ø> (ø)
...ews/extension-side/activation/activationManager.ts	100% <ø> (ø)
...iews/extension-side/activation/globalActivation.ts	92% <100%> (ø)
...ension-side/activation/workspaceActivation.node.ts	56% <100%> (ø)
...iews/extension-side/context/activeEditorContext.ts	93% <100%> (ø)
...webviews/extension-side/context/amlContext.node.ts	90% <100%> (ø)
...rc/webviews/extension-side/serviceRegistry.node.ts	100% <100%> (ø)
src/kernels/errors/jupyterInvalidKernelError.ts	62% <0%> (-38%)	⬇️
src/platform/common/cancellation.ts	59% <0%> (-10%)	⬇️
... and 10 more