Epic: Improve support for Events

[nventuro]

Support for events is still quite barebones, this aims to track the bits that are required to make them production ready.

• [ ] https://github.com/AztecProtocol/aztec-packages/issues/14367
• [ ] https://github.com/AztecProtocol/aztec-packages/issues/11571
• [ ] Deliver events to multiple recipients
• [ ] have public event indexing in the node (contract addr and selector, i.e. tag)
• [ ] figure out public event decoding (pack? ser? call fn?)