[nodes] Add new InputFile input node

[cbentejac]

Description

This PR adds a new basic InputNode that receives a file or directory as the input, and that can be used as the entry point of a graph for meshroom_batch.

[codecov]

Codecov Report

❌ Patch coverage is 72.41379% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.88%. Comparing base (17b411c) to head (06a83f6).
⚠️ Report is 6 commits behind head on develop.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
meshroom/nodes/general/InputFile.py	33.33%	16 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2933      +/-   ##
===========================================
+ Coverage    80.86%   80.88%   +0.02%     
===========================================
  Files           57       59       +2     
  Lines         7792     7853      +61     
===========================================
+ Hits          6301     6352      +51     
- Misses        1491     1501      +10     

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