Zap requests, event deletion, nostr test lib.

[Synesso]

• Add support for Zap requests as part of NIP-57
• Add support for event deletion request events.
• Release nostr-sdk-test package, which provides kotest-property Arb(itrary) builders for testing applications using nostr-sdk.

---

This discussion was created from the release Zap requests, event deletion, nostr test lib..