Add files pattern

[lundberg]

Add support for matching on file uploads.

Example:

respx.post("https://example.org/", files={"some_file": b"..."})
respx.post("https://example.org/", files={"some_file": ANY})
respx.post("https://example.org/", files={"some_file": ("filename.txt", b"...")})
respx.post("https://example.org/", files={"some_file": ("filename.txt", ANY)})

Fixes #115

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (master@07ae887). Click here to learn what that means.

❗ Current head b66080b differs from pull request most recent head c1a38e8. Consider uploading reports for the commit c1a38e8 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             master      #253   +/-   ##
==========================================
  Coverage          ?   100.00%           
==========================================
  Files             ?        21           
  Lines             ?      2845           
  Branches          ?       428           
==========================================
  Hits              ?      2845           
  Misses            ?         0           
  Partials          ?         0           

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[ziima]

Works for me. Files content types are not checked, but that may be fixed later.