Add relayerset mock and extra validation to limitAndSort proto helpers

[ilija42]

Requires

Supports

[jmank88]

Where is the mock used? It is usually cleaner to generate them locally. Our habit of exporting mocks is not a great one, especially with the name collisions from using just package mocks. Nbd in this case since there is local precedent already though 🤷

[ilija42]

Where is the mock used? It is usually cleaner to generate them locally. Our habit of exporting mocks is not a great one, especially with the name collisions from using just package mocks. Nbd in this case since there is local precedent already though 🤷

Using it for mocking the relayer in capabilities, could've added a mocks package there I guess