editoast: implement Authorizer creation middleware

[leovalais]

Half of the axum server is in main.rs and the rest in views/mod.rs. We'll need to homogenize that.

We removed the lazy role fetching and caching as this would require internal mutability since the Authorizer now lives in an Arc. Instead, we now fetch the roles when the Authorizer is initialized.

Closes #8276

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 36.74%. Comparing base (9d45d8c) to head (f7d3090). Report is 9 commits behind head on dev.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #8319 +/- ## ========================================= Coverage 36.73% 36.74% Complexity 2163 2163 ========================================= Files 1282 1282 Lines 119626 119651 +25 Branches 3218 3226 +8 ========================================= + Hits 43943 43962 +19 + Misses 73752 73750 -2 - Partials 1931 1939 +8 ``` | [Flag](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/8319/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [core](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/8319/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `75.59% <ø> (ø)` | | | [editoast](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/8319/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `66.84% <100.00%> (-0.05%)` | :arrow_down: | | [front](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/8319/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `15.73% <ø> (+0.04%)` | :arrow_up: | | [gateway](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/8319/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `2.03% <ø> (ø)` | | | [railjson_generator](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/8319/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `87.49% <ø> (ø)` | | | [tests](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/8319/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `72.98% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#carryforward-flags-in-the-pull-request-comment) to find out more.

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