feat: rate limit configuration

[anxolin]

Problem

Programmatic Orders is a decentralise system. Anyone can run watch towers and deploy their orders.

For convenience, we default to index all orders. However, some orders might be tests that yield broken orders, or we will see orders that make a check on every block when, once every 50 blocks is maybe enough.

Suggested solution

Configure the watch tower so it can slow down the checks for "some orders".

Ideally, we should be able to have a default rate limit for all new orders and be able to override it.

We should define a config that would give you the opportunity of reducing the consumption rate.