editoast: create editoast_models and move model v2 database tools

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 87.50000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 28.41%. Comparing base (4e8be63) to head (e14e6f5). Report is 7 commits behind head on dev.

Files	Patch %	Lines
editoast/editoast_models/src/db_connection_pool.rs	62.50%	3 Missing :warning:
editoast/src/generated_data/error/mod.rs	0.00%	1 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #7864 +/- ## ============================================ - Coverage 28.45% 28.41% -0.04% Complexity 2059 2059 ============================================ Files 1256 1264 +8 Lines 154603 155097 +494 Branches 3049 3053 +4 ============================================ + Hits 43989 44078 +89 - Misses 108797 109198 +401 - Partials 1817 1821 +4 ``` | [Flag](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/7864/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/7864/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `75.00% <ø> (ø)` | | | [editoast](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/7864/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `71.62% <87.50%> (+0.02%)` | :arrow_up: | | [front](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/7864/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `9.99% <ø> (+0.02%)` | :arrow_up: | | [gateway](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/7864/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `2.34% <ø> (ø)` | | | [railjson_generator](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/7864/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/7864/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `72.93% <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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