Include a plain text repr for when notebook is untrusted.

[jsignell]

Related Issue(s):

Close #1568

Demo:

Compare cell 12:

• on main: https://github.com/stac-utils/pystac/blob/v1.13.0/docs/quickstart.ipynb
  

• on this branch: https://github.com/jsignell/pystac/blob/plain-repr/docs/quickstart.ipynb
  

Description:

Borrowing logic from https://github.com/pydata/xarray/blob/5d9aa6e22955ed49d52659667adfe7abec6848b6/xarray/core/formatting_html.py#L296-L316

Note: I am using the same repr that you get if you just call print on an object. If we want to spruce that up we can in a separate PR.

PR Checklist:

• Pre-commit hooks pass (run pre-commit run --all-files)
• Tests pass (run pytest)
• 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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.38%. Comparing base (4748c0b) to head (9e8ed9f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1577   +/-   ##
=======================================
  Coverage   92.38%   92.38%           
=======================================
  Files          55       55           
  Lines        8374     8374           
  Branches      965      965           
=======================================
  Hits         7736     7736           
  Misses        453      453           
  Partials      185      185           

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