[Feature]: normalize case in spelling checks

[Bai-Li-NOAA]

Is your feature request related to a problem? Please describe.

Right now, the spelling check flags words that differ only by case (e.g., noaa vs. NOAA). @kellijohnson-NOAA found this issue when reviewing a FIMS PR.

Describe the solution you would like.

Maybe we can update the GHA from {ghactions4r} to normalize case before running the spelling check against the wordlist, so the words are checked in a case-insensitive way.

Describe alternatives you have considered

Relying on developers to manually correct capitalization every time they paste links or emails isn’t reliable.

Additional context

No response

[k-doering-NOAA]

That's a great idea! I wonder if the spelling package already has some built in capabilities?