Call da-collab back to invalidate and obtain new content if a change originated elsewhere

[bosschaert]

Description

da-collab is reached via a service binding if configured or otherwise through the address specified in the DA_COLLAB env var.

Note that while with this PR test coverage is going up, as src/routes/source.js is now covered, the computed coverage is down as this has now touched some dependencies which are not (yet) covered. This is a drawback of the way coverage was computed.

Related Issue

Fixes #28

Motivation and Context

It allows the editor to be updated when a change is made on the backend storage. This is also used when restoring a version from the UI.

How Has This Been Tested?

• Unit tests added
• Also tested locally with da-live and da-collab

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 60.55%. Comparing base (844658a) to head (23abfe9).

Files	Patch %	Lines
src/routes/source.js	88.88%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##              main      #29       +/-   ##
============================================
- Coverage   100.00%   60.55%   -39.45%     
============================================
  Files            4       13        +9     
  Lines          221      829      +608     
============================================
+ Hits           221      502      +281     
- Misses           0      327      +327     

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