Automatically create schemas for yaml config used by Hydra

[lebrice]

The goal is to automatically create schemas for the config files based on the _target_.

• This will be very helpful because it shows directly in the code editor what fields can be specified and what their default values are.

We could possibly create a standalone hydra plugin for this so it can be used by anyone that uses Hydra.

Demo:

demo_cropped.mp4

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.79041% with 80 lines in your changes missing coverage. Please review.

Project coverage is 71.08%. Comparing base (0cc6956) to head (53f3400).
Report is 2 commits behind head on master.

Files	Patch %	Lines
project/utils/auto_schema.py	84.22%	77 Missing ⚠️
project/utils/auto_schema_test.py	91.17%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #7      +/-   ##
==========================================
+ Coverage   66.21%   71.08%   +4.87%     
==========================================
  Files          52       54       +2     
  Lines        2921     3455     +534     
==========================================
+ Hits         1934     2456     +522     
- Misses        987      999      +12     

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