Expand rails-specific relationship detection

[trbgusto]

I'm not sure if this functionality is of interest to anyone else, but I figured I can share it here and close the PR if it's not something that should be merged. I'm also happy to add some changes if requested/useful.

What

Expand the relation detection for rails naming schemes by supporting custom column names and adding support for UUIDs.

Why

Ruby on Rails doesn't add foreign keys by default, instead relying on a specific naming scheme, which the -rails flag activates. In this scheme, table names are plural and each table has an id column. Child-tables reference the parent-table via "${singularParentTableName}.id", e.g. a table called companies would be referenced as company_id.

It's possible to use custom names for mapping columns in rails, often used to map two columns to two different records in the same parent table. This PR adds support for prefixed column names, e.g. original_company_id and current_company_id would both resolve to companies.id.

We also use UUIDs in some areas in addition to an autoincrementing ID field, and this PR adds support for _uuid suffices.