Get assets by eo:bands common_name or name

[jsignell]

Related Issue(s):

• Closes Referencing assets by eo:bands common_name #275

Description:

This PR adds a new get_assets method on the ItemEOExtension class:

import pystac_client
import planetary_computer
from pystac.extensions.eo import EOExtension

catalog = pystac_client.Client.open(
    "https://planetarycomputer.microsoft.com/api/stac/v1",
    modifier=planetary_computer.sign_inplace,
)

landsat = catalog.get_collection("landsat-c2-l2")
item = next(landsat.get_items())

eo_ext = EOExtension.ext(item)
eo_ext.get_assets()

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

Patch coverage: 100.00% and no project coverage change.

Comparison is base (d55cc15) 90.92% compared to head (81fff4c) 90.92%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1140   +/-   ##
=======================================
  Coverage   90.92%   90.92%           
=======================================
  Files          49       49           
  Lines        6631     6634    +3     
  Branches      975      976    +1     
=======================================
+ Hits         6029     6032    +3     
  Misses        422      422           
  Partials      180      180           

Impacted Files	Coverage Δ
pystac/extensions/eo.py	93.92% <100.00%> (+0.07%)	⬆️

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