Item assets

[jsignell]

Related Issue(s):

• Closes Deprecate item_assets extension and move into collection core #1380

Description:

>>> import pystac
>>> 
>>> collection = pystac.Collection.from_file("./tests/data-files/catalogs/cbers-partial/CBERS4MUX/collection.json")
>>> collection.item_assets
{'thumbnail': <pystac.item_assets.ItemAssetDefinition at 0x72aea0420750>,
 'metadata': <pystac.item_assets.ItemAssetDefinition at 0x72aea017dc90>,
 'B5': <pystac.item_assets.ItemAssetDefinition at 0x72aea017efd0>,
 'B6': <pystac.item_assets.ItemAssetDefinition at 0x72aea016d5d0>,
 'B7': <pystac.item_assets.ItemAssetDefinition at 0x72aea016e050>,
 'B8': <pystac.item_assets.ItemAssetDefinition at 0x72aea016da90>}
>>> collection.item_assets["thumbnail"].title
'Thumbnail'
>>> collection.item_assets["thumbnail"].title = "fake"
>>> collection.item_assets["thumbnail"].title
'fake'
>>> collection.item_assets["B4"] = {
    'type': 'image/tiff; application=geotiff; profile=cloud-optimized',
    'eo:bands': [{'name': 'B4', 'common_name': 'red'}]
}
>>>collection.item_assets["B4"].owner == collection
True

Notes:
This approach is a little wonky, but it is a backwards compatible change. Shown here passing with no test changes.

TODO:

• Add deprecation warning when accessing the ItemAssetsExtension class. I think the simplest approach will be to warn when instantiating that class.
• Add tests/docs demonstrating new access patterns.

PR Checklist:

• Pre-commit hooks and 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 82.48588% with 31 lines in your changes missing coverage. Please review.

Project coverage is 90.94%. Comparing base (97f87cb) to head (a688988).

Files with missing lines	Patch %	Lines
pystac/item_assets.py	83.33%	14 Missing and 1 partial ⚠️
pystac/collection.py	46.15%	7 Missing ⚠️
pystac/extensions/datacube.py	75.00%	0 Missing and 1 partial ⚠️
pystac/extensions/eo.py	83.33%	0 Missing and 1 partial ⚠️
pystac/extensions/pointcloud.py	80.00%	0 Missing and 1 partial ⚠️
pystac/extensions/projection.py	80.00%	0 Missing and 1 partial ⚠️
pystac/extensions/sar.py	80.00%	0 Missing and 1 partial ⚠️
pystac/extensions/sat.py	80.00%	0 Missing and 1 partial ⚠️
pystac/extensions/storage.py	80.00%	0 Missing and 1 partial ⚠️
pystac/extensions/table.py	75.00%	0 Missing and 1 partial ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1476      +/-   ##
==========================================
- Coverage   91.17%   90.94%   -0.23%     
==========================================
  Files          52       53       +1     
  Lines        7251     7278      +27     
  Branches      875      880       +5     
==========================================
+ Hits         6611     6619       +8     
- Misses        460      479      +19     
  Partials      180      180              

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