feat: add propFindUnfiltered public method to Client (4.6)

[phil-davis]

backport of #1519

To preserve backward-compatibility I added the last commit db80aae in addition to all the commits from master.

The original client propFind function needs to preserve its existing untyped parameters to be strictly backward-compatible.

I added some unit test cases to check what happens when $url is passed as an int (a file called "123456" might be passed as the integer 123456), and what happens when depth of 1 is passes as the string "1". We should let callers still be able to do those things in the current release series.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (4.6@f2fa433). Click here to learn what that means.

Additional details and impacted files

@@          Coverage Diff           @@
##             4.6    #1526   +/-   ##
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  Coverage       ?   97.32%           
  Complexity     ?     2836           
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  Files          ?      175           
  Lines          ?     9433           
  Branches       ?        0           
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  Hits           ?     9181           
  Misses         ?      252           
  Partials       ?        0           

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