Initial batch of changes to enable bundling of the extension

[DonJayamanne]

For #3021

• Tests will be tracked here Create smoke tests for extension (when bundled) #3383
• Will need to update package.json seprately (for CD)

• Pull request represents a single change (i.e. not fixing disparate/unrelated things in a single PR)
• Title summarizes what is changing
• [no] Has a news entry file (remember to thank yourself!)
• [no] Unit tests & system/integration tests are added/updated
• [no] Test plan is updated as appropriate
• package-lock.json has been regenerated by running npm install (if dependencies have changed)

[d3r3kk]

Looks good. Can't wait to see it in action!

[DonJayamanne]

Looks good. Can't wait to see it in action!

Won't, until I get the YAML stuff in.
Cuz the CI and CD pipelines need to change.

• The commands used to compile and build the extension
• Subsequently commands used to upload
  • Cuz after all tests pass, we need to bundle using webpack
  • Run smoke tests
  • Finally upload this webpack bundled version to azure blob store
  • I.e. totally new process