allow passing kwargs to sftp client

[ttomasz]

Fixes #39

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.07%. Comparing base (64cc6ef) to head (59a8fe7).
Report is 1 commits behind head on main.

❗ Current head 59a8fe7 differs from pull request most recent head b971999

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #41      +/-   ##
==========================================
- Coverage   94.19%   94.07%   -0.13%     
==========================================
  Files          13       13              
  Lines         723      742      +19     
==========================================
+ Hits          681      698      +17     
- Misses         42       44       +2     

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[ttomasz]

@efiop Would you mind reviewing this PR?

[efiop]

Hey, @ttomasz , thanks for the PR! Please see some suggestions above.

[shcheklein]

@ttomasz a gentle reminder :) or can we close this PR?

[ttomasz]

Sorry, was quite busy past few months 😅 I should be able to finish this up in June.

[ttomasz]

Changed popping kwargs to separate parameter for stuff to pass to underlying library.

[ttomasz]

Sorry for the mess with the commits. Do you want me to revert client_args/connect_args to being kwargs instead of parameter? Or is the current state ok?