feat: add support for defining hasOne with FK

[thetutlage]

Fixes: FRMW-2825

In this PR we add support for defining hasOne relationship in DML with support for foreign keys. This is added because of the way relationships are defined within our Medusa modules and many of them needs a hasOne with Cascades and FK on the same side.

A good example of this is Cart and Address. The relationship is defined as Cart hasOne Address and the Cart model has the address_id. Also, we want a new address to be created automatically via cascades: ['persist'] setting when defined on a Cart.

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[adrien2p]

LGTM, lets move with this and see how it goes during the rest of the migration

[thetutlage]

@olivermrbl and @shahednasser. We do not want to document this right now, as we might see some breaking changes coming to hasOne with foreign keys as we migrate modules.