Add _cat_file

[kephale]

Howdy folks, sshfs is amazing. Thank you for everything!

I was trying to use it for remote visualization of zarr images. This required support for _cat_file. This PR provides a _cat_file implementation.

[shcheklein]

Thanks @kephale ! Looks good, I think someone else will also take a look and merge. A few comments. Please take a look.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.10%. Comparing base (c127831) to head (607ce56).

❗ Current head 607ce56 differs from pull request most recent head 8202cf1. Consider uploading reports for the commit 8202cf1 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #45      +/-   ##
==========================================
+ Coverage   94.00%   94.10%   +0.10%     
==========================================
  Files          13       13              
  Lines         701      713      +12     
==========================================
+ Hits          659      671      +12     
  Misses         42       42              

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[shcheklein]

@martindurant @efiop PTAL and merge if it looks good (I don't have access to this repo).

[martindurant]

LGTM

@efiop , what are your plans for maintenance of this repo? Are you still available for making releases?

[efiop]

@martindurant I've set up everything in the past to work even if I get hit by a bus :) Just for the record, one could just go to https://github.com/fsspec/sshfs/releases and click release, gha will do its magic 🙂 Triggered 2024.4.0 for now. As to maintaining, I am keeping an eye, but obviously no promises on the reaction time.

[efiop]

Also added @shcheklein to admins here.