feat: advanced page and localized driver settings

[SychO9]

Part of #3884 (#3884 (comment))

Changes proposed in this pull request:

• Adds an advanced page where search drivers can be configured per model (will contain more settings in the future, hence the visual sections)
• Localizes search driver names and model names (applies that to other driver settings like slug and display name drivers).
• Adds a toggle underneath the clear cache button.
• The toggle is hidden if the advanced page is empty (at this time that is the case when there are no alternative search drivers installed).

Screenshot

This is emulating having an alternative search driver installed for many models

Necessity

• Has the problem that is being solved here been clearly explained?
• If applicable, have various options for solving this problem been considered?
• For core PRs, does this need to be in core, or could it be in an extension?
• Are we willing to maintain this for years / potentially forever?

Confirmed

• Frontend changes: tested on a local Flarum installation.
• Backend changes: tests are green (run composer test).
• Core developer confirmed locally this works as intended.
• Tests have been added, or are not appropriate here.

Required changes:

• Related documentation PR: (Remove if irrelevant)
• Related core extension PRs: (Remove if irrelevant)

[SychO9]

I'll merge any and all search-related PRs into a separate #3893 branch so that they can still be reviewed before merging this new branch into 2.x (I need to continue building on top of all the work done so far).