Feature: Generic Service For Associative Table

[harpocrates12]

It would be nice to have a generic service that:

• receives an array of requested id_pairs (like used in associative tables)

PPPT::Simple::Plural::DeleteInsert.new.call(
  [
    { some_id: 1, some_other_id: 2},
    { some_id: 1, some_other_id: 3},
  ]
)

And takes care of:

• finding existent records
• infer outdated records and delete them
• infer new 'records' and insert them

[harpocrates12]

@mull descriptive enough?

[harpocrates12]

I guess there is an underlying assumption in this behaviour that whenever called the service will be provided with all currently relevant id_pairs.

Not sure if that is an issue or if it is sufficient to make that assumption explicit with the service name/description.