Dart / Flutter NDK version 0.2

https://pub.dev/packages/ndk

What's new / Changelog:

- NIP-47 Nostr Wallet Connect (with nip-44 support)

- NIP-57 Zaps support

- NIP-42 Authentication of clients to relays

- NIP-44 Encrypted Payloads (Versioned)

- Unification of RelayManager in JIT

- web_socket_client nostr transport implementation with backoff reconnects

- Melos support, separated monorepos for isar/object_box/amber/rust_verifier

- Objectbox cache initial support of basic models

- Isar cache support

- many bugfixes and improvements in relay timeout handling

Thanks to nostr:npub1wf4pufsucer5va8g9p0rj5dnhvfeh6d8w0g6eayaep5dhps6rsgs43dgh9 for testing it in nostr:npub10r8xl2njyepcw2zwv3a6dyufj4e4ajx86hz6v4ehu4gnpupxxp7stjt2p8 and suggesting improvements.

Thanks to nostr:npub10pensatlcfwktnvjjw2dtem38n6rvw8g6fv73h84cuacxn4c28eqyfn34f for the grant support.