Allow multiple proj versions

[gadomski]

Related Issue(s):

• Bandaid that we need until we sort out Handling STAC extension version upgrades #448
• Should fix issues like stac_load raises Failed to auto-guess CRS/resolution opendatacube/odc-stac#105

Description:

This is a pull request against the v1.7 branch, and is intended to be immediately released in a v1.7.2 bugfix release. Once released, it should be merged into main via a second PR.

When we updated the projection extension version, we inadvertently broke any downstreams that used the ProjectionExtension class on items w/ v1.0.0 of the extension. That was bad. This fixes that problem, and provides a pattern that we can use when we do future extension upgrades.

There were no functional changes to the projection extension in #989 so I think we can safely assume we can use the same class interface for v1.0.0 and v1.1.0 items.

This really is a kludgy bandaid, but might be all that we can do until v2.

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: Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.

Project coverage is 90.31%. Comparing base (f7398bc) to head (8c46f02).

Files	Patch %	Lines
pystac/extensions/projection.py	66.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             v1.7    #1081      +/-   ##
==========================================
- Coverage   90.34%   90.31%   -0.03%     
==========================================
  Files          47       47              
  Lines        6213     6219       +6     
  Branches      929      931       +2     
==========================================
+ Hits         5613     5617       +4     
- Misses        422      423       +1     
- Partials      178      179       +1     

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