Add local file implementation using java.nio.file.Path

[simon04]

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 18.30986% with 58 lines in your changes missing coverage. Please review.

Project coverage is 70.01%. Comparing base (857d56a) to head (040a88b). Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
src/main/java/net/schmizz/sshj/xfer/PathFile.java	18.96%	47 Missing :warning:
...ain/java/net/schmizz/sshj/xfer/FilePermission.java	15.38%	11 Missing :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1001      +/-   ##
============================================
- Coverage     70.43%   70.01%   -0.43%     
- Complexity     1542     1548       +6     
============================================
  Files           215      216       +1     
  Lines          7914     7983      +69     
  Branches        682      688       +6     
============================================
+ Hits           5574     5589      +15     
- Misses         1985     2038      +53     
- Partials        355      356       +1     

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