[WIP] Add the ability to combine aliases

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original issue description:

#623 added ransack aliases, so long query strings like owner_first_name_or_owner_last_name can be shortened to owner. This feature is great, but it'd be even better if we could combine those aliases with _or_ like any other query string.

Example:

class Post < ApplicationRecord
  ransack_alias :owner, :owner_first_name_or_owner_last_name
  ransack_alias :approver, :approver_first_name_or_approver_last_name
end

Post.ransack(owner_or_approver_cont: "Bob")

Fixes #847

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