Get subset of building data, not all.

[jamesturner246]

Description

This PR adds code for interfacing with Overture for building data, allowing the download of only a subset of data (constrained by a given bounding box), instead of the entire dataset for the country. The downloaded building.geoparquet file is significantly smaller as a result.

I left the original national downloader in for not, in case it's still useful.

I have not tested this yet, beyond peering inside the geoparaquet file (I run Linux, so can't run the GUI). Please could you confirm?

Some things to note:

• There are two endpoints: S3 or Azure (I arbitrarily chose S3)
• S3 region is fixed, as only us-west-2 is available
• I haven't yet figured out the version parameter, how to auto pick latest, or if that's even possible without hacking
• I'm not so familiar with the data formats, so extra optimisation is perhaps possible.

Fixes #133

Type of change

• Documentation (non-breaking change that adds or improves the documentation)
• New feature (non-breaking change which adds functionality)
• Optimization (non-breaking, back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (whatever its nature)

Key checklist

• All tests pass (eg. python -m pytest)
• The documentation builds and looks OK (eg. python -m sphinx -b html docs docs/build)
• Pre-commit hooks run successfully (eg. pre-commit run --all-files)

Further checks

• Code is commented, particularly in hard-to-understand areas
• Tests added or an issue has been opened to tackle that in the future. (Indicate issue here: # (issue))

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.91%. Comparing base (6346642) to head (6ab0307).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #334      +/-   ##
==========================================
+ Coverage   86.76%   86.91%   +0.15%     
==========================================
  Files          22       22              
  Lines        2199     2217      +18     
  Branches      280      280              
==========================================
+ Hits         1908     1927      +19     
  Misses        214      214              
+ Partials       77       76       -1     

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[barneydobson]

I added a -m downloads test (which passes) just to make sure.

LGTM! Thanks so much

[jamesturner246]

You're welcome. Glad it helped!