Handle `*_DELEGATE` Transaction Service events

[iamacook]

Summary

The Transaction Service now emits new *_DELEGATE events for creating, updating and deleting delegates:

• NEW_DELEGATE
• UPDATED_DELEGATE
• DELETED_DELEGATE

This adds the relevant validation and handling of the aforementioned, clearing the delegates cache accordingly.

Changes

• Add schemas, inferred entities and relevant builders
• Add method to clear delegates, called by each event

[iamacook]

~I'm marking this as a draft for now as there is no chain identifier for each event. I've discussed this with @falvaradorodriguez, and he will add them soon. A chainId property is preemptively added accordingly.~

This has now been resolved.