Support collection list with top level links property

[moradology]

The OGC standards seem to suggest that a top-level links property should be supported by the /collections endpoint. This PR adds a class to support this slightly more sophisticated list of collections. This change would be useful e.g. here: https://github.com/stac-utils/stac-fastapi/blob/master/stac_fastapi/api/stac_fastapi/api/app.py#L154

[codecov-commenter]

Codecov Report

Merging #81 (9386a05) into master (d222206) will decrease coverage by 0.12%.
The diff coverage is 91.66%.

@@            Coverage Diff             @@
##           master      #81      +/-   ##
==========================================
- Coverage   96.38%   96.25%   -0.13%     
==========================================
  Files          19       20       +1     
  Lines         442      454      +12     
==========================================
+ Hits          426      437      +11     
- Misses         16       17       +1     

Flag	Coverage Δ
unittests	96.25% <91.66%> (-0.13%)	⬇️

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Impacted Files	Coverage Δ
stac_pydantic/api/collections.py	90.90% <90.90%> (ø)
stac_pydantic/api/__init__.py	100.00% <100.00%> (ø)

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[lossyrob]

@moradology LGTM, can you run the pre-commit formatter on it so it passes CI?

[geospatial-jeff]

lgtm!

[moradology]

I believe a maintainer will have to pull the trigger on this one as I lack write access to this repo.

Perhaps there's a better place for this question but, as the changes here will be useful for a slight modification to stac-fastapi which makes Collection list endpoint compliant with the STAC spec, how far off from the next release are we?

[moradology]

I think CI should succeed here. black has been run and test coverage is just north of 95%. Perhaps CI needs to be rerun but I think I lack the perms

[lossyrob]

@moradology CI was re-rerun...perhaps this is an issue with the version of black? pydantic/stac-pydantic/stac_pydantic/api/__init__.py is failing formatting. I also re-ran #90 CI and it failed on black as well. Something seems amiss with your local black matching CI's, maybe the version issue or it's not finding some local configuration

[moradology]

Agreed, I think there's something off with my local version of black because it is not catching anything wrong. just a bunch of unchanged files locally:

Investigating now...

[moradology]

@lossyrob Your guess about versions was on the money: black==19.10b0 is an absolute must. I guess major version 20 is less picky