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feat(core): use composite PK in many to many relations (#204)

Previously it was required to have autoincrement primary key for m:n pivot tables. Now this
has changed. By default, only foreign columns are required and composite key over both of them
is used as primary key.

BREAKING CHANGE:
M:N collection items no longer have fixed order by default. To preserve stable order of collections,
you can force previous behaviour by defining the m:n property as `fixedOrder: true`, which will start
ordering by `id` column. You can also override the order column name via `fixedOrderColumn: 'order'`.

You can also specify default ordering via `orderBy: { ... }` attribute.

Closes #121

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