Remove application roles

[leovalais]

Follow up #8984

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Review commits individually.

• Adds the Superuser builtin role
• Adds the --superuser cmd flag
• Removes the RoleConfig
• Harmonizes the serialization of builtin role: we use the serde representation for everything. It's easier to manage, less error-prone, and the OpenAPI description of the endpoints becomes much more ergonomic.

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Codecov Report

Attention: Patch coverage is 81.25000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 37.15%. Comparing base (efce7b7) to head (21b7e98).
Report is 16 commits behind head on dev.

Files with missing lines	Patch %	Lines
editoast/editoast_authz/src/authorizer.rs	75.00%	2 Missing ⚠️
editoast/src/client/mod.rs	0.00%	2 Missing ⚠️
editoast/src/views/authz.rs	0.00%	2 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #9157      +/-   ##
============================================
- Coverage     37.22%   37.15%   -0.07%     
  Complexity     2242     2242              
============================================
  Files          1265     1265              
  Lines        116356   116174     -182     
  Branches       3279     3280       +1     
============================================
- Hits          43315    43166     -149     
+ Misses        71087    71053      -34     
- Partials       1954     1955       +1     

Flag	Coverage Δ
core	74.78% <ø> (ø)
editoast	72.05% <79.31%> (-0.06%)	⬇️
front	15.32% <100.00%> (-0.01%)	⬇️
gateway	2.22% <ø> (ø)
osrdyne	2.56% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	86.46% <ø> (ø)

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[Khoyo]

Adds the --superuser cmd flag

Shouldn't it rather be named --single-user ? Since it doesn't give you a superuser role, it treats all users as superusers (which is what single user mode usually is)

Or maybe something more explicit, like --disable-access-control or --disable-authorization

[flomonster]

Great PR! 🙏