RI-7192: add useFtCreateCommand()

[pawelangelow]

This hook is responsible for generating the FT.CREATE command used to create RediSearch indexes, based on the index name and schema selected by the user.

For the initial version of the feature, we're using hardcoded data to support UI development, so the hook currently returns a hardcoded command. This will be replaced with dynamic generation logic as the feature progresses.

While this could technically be a utility function, it's implemented as a hook for now since we'll likely need to fetch additional data from Redis (e.g., key types, sample data, or schema suggestions). Once the full feature is in place, we can revisit and refactor it into a plain function if needed.