added fwf reader

[swapdewalkar]

Address #837

Changes

Changed in pandas extension files

How I tested this

unit tests

Notes

Checklist

• PR has an informative and human-readable title (this will be pulled into the release notes)
• Changes are limited to a single goal (no scope creep)
• Code passed the pre-commit check & code is left cleaner/nicer than when first encountered.
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• Placeholder code is flagged / future TODOs are captured in comments
• Project documentation has been updated if adding/changing functionality.

[skrawcz]

looks good, just pre-commit failure to fix please!

[skrawcz]

Thanks @swapdewalkar I realized I could easily update the pre-commit fix myself.