Add bands

[gadomski]

Related Issue(s):

• Implementation of RFC: A common construct to replace `raster:bands` and `eo:bands` radiantearth/stac-spec#1213 (comment)
• Closes Add Asset.bands #1225

Description:

WIP until STAC 1.1 is out w/ bands. Might need more fields on bands.

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 94.20290% with 4 lines in your changes missing coverage. Please review.

Project coverage is 91.63%. Comparing base (1e2f3db) to head (c703ea8).
Report is 179 commits behind head on main.

Files with missing lines	Patch %	Lines
pystac/band.py	81.81%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1238      +/-   ##
==========================================
+ Coverage   91.61%   91.63%   +0.02%     
==========================================
  Files          51       52       +1     
  Lines        6843     6912      +69     
  Branches     1009     1024      +15     
==========================================
+ Hits         6269     6334      +65     
- Misses        399      402       +3     
- Partials      175      176       +1     

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