Get username and key file from ssh config files for SFTP

[wayhoww]

By adding this feature we can sync via SFTP by simply invoking command like:

gofs  -source="./source" -dest="sftp://host?remote_path=/path/to/dest"

[codecov]

Codecov Report

Attention: Patch coverage is 88.63636% with 5 lines in your changes missing coverage. Please review.

Project coverage is 32.91%. Comparing base (5309c6f) to head (5a50f3b).

Files	Patch %	Lines
core/vfs.go	88.63%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #367      +/-   ##
==========================================
+ Coverage   32.53%   32.91%   +0.38%     
==========================================
  Files         133      133              
  Lines        6059     6101      +42     
==========================================
+ Hits         1971     2008      +37     
- Misses       3997     4000       +3     
- Partials       91       93       +2     

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[mstmdev]

Tests passed. Please check for any issues with this implementation. @wayhoww

[wayhoww]

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