Cannot subscribe to a pivot table

[Towerful]

Often pivot tables are constructed using a composite primary key to establish a relationship between 2 tables.
Supabase/postgREST allows for "collapsing" the pivot table data when used like this.

Allowing an array as the idField and checking appropriately allows to subscribe to pivot tables.

--PR incoming...-- No PR incoming, cause I didnt branch

[Towerful]

Ah, shoot. I messed up the commit.

Towerful@5195cbc

details the change