feat: config system

[lennartkloock]

Proposed changes

Added a new configuration system which allows for:

• automatic generation of clap command arguments.
• env parsing.
• file parsing in json, toml and yaml.

Supports a hierarchy system so you can specify which values to use over other values.

Types of changes

What types of changes does your code introduce to Scuffle? Put an x in the boxes that apply

• [ ] Bugfix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation Update (if none of the other choices apply)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• [x] I have read the CONTRIBUTING doc
• [x] Lint and unit tests pass locally with my changes
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] I have added necessary documentation (if appropriate)
• [x] Any dependent changes have been merged and published in downstream modules

[codecov[bot]]

Codecov Report

Merging #97 (2a04f77) into main (1dd88a4) will decrease coverage by 0.29%. The diff coverage is 72.33%.

:exclamation: Current head 2a04f77 differs from pull request most recent head 9b7bcda. Consider uploading reports for the commit 9b7bcda to get more accurate results

@@            Coverage Diff             @@
##             main      #97      +/-   ##
==========================================
- Coverage   74.20%   73.91%   -0.29%     
==========================================
  Files         216      229      +13     
  Lines       15628    17440    +1812     
==========================================
+ Hits        11596    12890    +1294     
- Misses       4032     4550     +518     

Impacted Files	Coverage Δ
backend/api/src/api/v1/gql/handlers.rs	74.87% <0.00%> (-4.29%)	:arrow_down:
config/config/src/error.rs	26.96% <26.96%> (ø)
backend/api/src/api/middleware/auth.rs	89.83% <50.00%> (ø)
config/config/src/sources/utils.rs	50.76% <50.76%> (ø)
config/config/src/primitives.rs	56.20% <56.20%> (ø)
video/transcoder/src/transcoder/job/variant/mod.rs	78.34% <60.71%> (-0.74%)	:arrow_down:
backend/api/src/api/v1/gql/subscription/user.rs	90.69% <62.50%> (-3.90%)	:arrow_down:
common/src/logging.rs	87.50% <62.50%> (-7.50%)	:arrow_down:
backend/api/src/grpc/api.rs	80.87% <66.66%> (-0.10%)	:arrow_down:
config/config/src/sources/file/json.rs	69.56% <69.56%> (ø)
... and 20 more