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

Attention: 6 lines in your changes are missing coverage. Please review.

Files	Coverage Δ
pystac/extensions/virtual_assets.py	83.78% <83.78%> (ø)

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