Multi bridge integration

[orzocogorzo]

When a form has multiple bridges Forms Bridge triggers each bridge submission in a sequential loop, in the same order that the bridges are retrieved from the database.

Observations:

1. Currently, it is not possible to control this execution order.
2. If one bridge submission returns an error, the entire loop is aborted.

Options:

1. Define an order on the bridge schema to sort bridges
2. Implement something like depends_on mechanims.

At the same time it is worth to considering the possibility of allowing the loop to continue when a bridge submission fails. However, where should this setting be placed? It only make sense in the this context, but nothing like a chain of bridges currently exists in the logic...