Add ability to manage Listing Categories in /admin

[fdocr]

Is your feature request related to a problem? Please describe.

The Admin dashboard (/admin) currently has a Listings section that allows administrators to manage them but we are lacking a way to manage Listing Categories.

Describe the solution you'd like

A common Rails CRUD dashboard for Listing Categories (/admin/listings/categories). This would require a new controller with at least an index, new, create, edit and update actions. For reference there's this PR (#10153) for Display Ads that can be used as blueprint for guidance.

As this can be considered a "nested dashboard" and in order to avoid growing the admin side menu (left) too much, the following is a suggested placement of the link/button that will take the administrators to the Listing Categories dashboard:

Additional context

This is part of a larger effort to remove the /resource_admin dashboard in favor of /admin.

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[Rafi993]

Hello there, If this up for taking I can help.

[rhymes]

Ok @Rafi993, I've assigned this to you

[Rafi993]

Thank you @rhymes