Feat/wip virtual assets

[abarciauskas-bgse]

Related Issue(s):

• Relase virtual assets and add to pystac extensions stac-extensions/virtual-assets#2

Description:

Adds the virtual asset extension. This is a WIP as the virtual assets extension is not released yet. Just opening to get feedback from @jsignell and in case it helps @emmanuelmathot in adoption of virtual assets.

PR Checklist:

• pre-commit hooks pass locally
• Tests pass (run scripts/test)
• Documentation has been updated to reflect changes, if applicable
• This PR maintains or improves overall codebase code coverage.
• Changes are added to the CHANGELOG. See the docs for information about adding to the changelog.

[codecov]

Codecov Report

❌ Patch coverage is 83.78378% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.51%. Comparing base (9c323c4) to head (2f577ad).
⚠️ Report is 301 commits behind head on main.

Files with missing lines	Patch %	Lines
pystac/extensions/virtual_assets.py	83.78%	3 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1237      +/-   ##
==========================================
- Coverage   91.56%   91.51%   -0.05%     
==========================================
  Files          51       52       +1     
  Lines        6849     6886      +37     
  Branches     1011     1014       +3     
==========================================
+ Hits         6271     6302      +31     
- Misses        401      404       +3     
- Partials      177      180       +3     

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