Isolate editoast search engine into a dedicated crate

[leovalais]

Since the incremental computing prototype is postponed, we might as well do this now.

• Moves everything in editoast_search expect the endpoint.
• Adapt paths generated by the Search derive macro.
• Changes functions returning an editoast custom Result to return a standard one instead.
• Forwards search engine errors up to the API level, with updated i18n keys.
• Merges views/search/mod.rs and views/search/objects.rs into views/search.rs.

[codecov-commenter]

:warning: Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

Attention: Patch coverage is 43.25843% with 101 lines in your changes missing coverage. Please review.

Project coverage is 28.46%. Comparing base (7353c7a) to head (4167ebc). Report is 15 commits behind head on dev.

Files	Patch %	Lines
editoast/editoast_search/src/lib.rs	0.00%	54 Missing :warning:
editoast/editoast_search/src/dsl.rs	47.50%	21 Missing :warning:
editoast/src/views/search.rs	40.00%	12 Missing :warning:
editoast/editoast_search/src/context.rs	58.82%	7 Missing :warning:
editoast/editoast_derive/src/search.rs	86.36%	3 Missing :warning:
editoast/editoast_search/src/searchast.rs	77.77%	2 Missing :warning:
editoast/editoast_search/src/process.rs	90.00%	1 Missing :warning:
editoast/editoast_search/src/typing.rs	83.33%	1 Missing :warning:

:exclamation: Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #7906 +/- ## ============================================ - Coverage 28.54% 28.46% -0.08% Complexity 2059 2059 ============================================ Files 1249 1254 +5 Lines 154182 154578 +396 Branches 3036 3047 +11 ============================================ - Hits 44009 44000 -9 - Misses 108363 108763 +400 - Partials 1810 1815 +5 ``` | [Flag](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/7906/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/7906/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `75.00% <ø> (+0.04%)` | :arrow_up: | | [editoast](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/7906/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `71.37% <43.25%> (-0.31%)` | :arrow_down: | | [front](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/7906/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `9.97% <ø> (-0.03%)` | :arrow_down: | | [gateway](https://app.codecov.io/gh/OpenRailAssociation/osrd/pull/7906/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/7906/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/7906/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.

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.