😊 Basic Nostr library (#14)

* fix: set default formatter for supported filetypes

* refactor: add rustfmt config

* feat: some nostr types

* feat: setup client module

* feat: progress on event content

* fix: event kind deserialization

* refactor: rustfmt

* feat: make event content a string for now

* feat: builder pattern for filters

* feat: minor changes

* feat: serialize and deserialize for messages

* refactor: remove event tags

* feat: add prelude

* feat: add event timestamp

* feat: generate event id and event sig

* feat: replace new with new_signed

* feat: progress on client relays

* feat: send and receive messages

* fix: req serialization

* feat: add relays and start listening

* fix: preserve order on json macro for tests

* refactor: move tests into seperate modules

* feat: verify event

* feat: serialize and deserialize event in test

* refactor: remove event kind test

https://github.com/jonassterud/cyanocitta/commit/cc98795e86e5c23f21ffacf98dc12b33a8fa93d7