wbt_file_path: add support for terra objects that have a file source

[brownag]

wbt_file_path: add support for terra objects that have a file source for raster and vector inputs

• for Documentation unclear for wbt_principal_component_analysis #119

[codecov-commenter]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (6cbf9c6) 8.88% compared to head (9315077) 8.91%.

❗ Current head 9315077 differs from pull request most recent head 73858d6. Consider uploading reports for the commit 73858d6 to get more accurate results

Files	Patch %	Lines
R/wbt.R	30.00%	7 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff            @@
##           master    #121      +/-   ##
=========================================
+ Coverage    8.88%   8.91%   +0.02%     
=========================================
  Files          21      21              
  Lines        8381    8391      +10     
=========================================
+ Hits          745     748       +3     
- Misses       7636    7643       +7     

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