This PR adds a new set of services that can be used to manage a DB
schema (workspace schema in this case) such as creating tables, columns,
enums, indexes, FK, etc... Nothing should be new as I've simply
reimplemented what we can already do in the current workspace migration
runner but this using raw queries for everything as we faced some
performances issues in the past using the orm API directly. Some methods
are new but were picked from usages in migration commands so I took the
liberty to implement them as well in case they are still needed.
This is isolated enough to be used in a command but the first use case
will be to use it in the new WorkspaceSchemaMigrationRunnerService that
will call those methods from the migration instructions
