Preliminary support for editing notebooks

[rchiodo]

This is still a work in progress, but this submission will add support for editing ipynb files.

There are a number of things left to do, but all functional tests for the existing code base should be passing.

List of stuff left to do can be found in item #5959

• 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 enhancements.
• 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)
• The wiki is updated with any design decisions/details.

[rchiodo]

"python.linting.pycodestyleEnabled": false,

I should undo these changes too
#Resolved

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Refers to: src/test/.vscode/settings.json:14 in 63170b4. [](commit_id = 63170b4, deletion_comment = True)

[codecov-io]

Codecov Report

Merging #7222 into master will decrease coverage by 0.25%.
The diff coverage is 18.68%.

@@            Coverage Diff             @@
##           master    #7222      +/-   ##
==========================================
- Coverage   58.55%   58.29%   -0.26%     
==========================================
  Files         486      493       +7     
  Lines       21460    21661     +201     
  Branches     3463     3486      +23     
==========================================
+ Hits        12566    12628      +62     
- Misses       8116     8255     +139     
  Partials      778      778

Impacted Files	Coverage Δ
...ascience/jupyter/liveshare/hostJupyterExecution.ts	45.45% <ø> (ø)	⬆️
...activation/languageServer/languageClientFactory.ts	95.12% <ø> (ø)	⬆️
...ractive-common/interactiveWindowMessageListener.ts	20% <ø> (ø)
src/datascience-ui/interactive-common/tokenizer.ts	0% <ø> (ø)
src/client/common/types.ts	100% <ø> (ø)	⬆️
...ence/interactive-common/intellisense/conversion.ts	13.2% <ø> (ø)
...nce/jupyter/liveshare/liveShareParticipantMixin.ts	44.44% <ø> (ø)	⬆️
...active-common/intellisense/intellisenseDocument.ts	58.82% <ø> (ø)
...ence/interactive-common/intellisense/wordHelper.ts	19.67% <ø> (ø)
...ent/datascience/jupyter/jupyterExecutionFactory.ts	75.6% <ø> (ø)	⬆️
... and 40 more

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