NDK 2.3.0 released!

Improvements in UX through cache performance and more aggressive caching.

* NIP-42 support via custom Auth Policies

* Allows setting a relay or subscription as trusted to skip signature verification

* Fix bug that caused flapping relays to not get subscriptions re-added when the relay comes back

* Redis-cache: cache generic filters to find cache hits

* Cache NIP-05 queries