Function createRatchetMessagesProvider

createRatchetMessagesProvider(deps: ProviderDeps): MessagingProvider
The ratchet provider: double-ratchet sessions whose keys change with every message. Experimental; both sides need an app that speaks it. Specified by the nostr-double-ratchet draft.
Parameters
- deps: ProviderDeps
  Backend constructor and availability check supplied by the shell.
Returns MessagingProvider
A MessagingProvider with id ratchet.
Example
```
registry.register(createRatchetMessagesProvider({
  createBackend: () => ratchetAdapter,
  available: () => (runtime ? { available: true } : { available: false, reason: 'no-ratchet-runtime' }),
}));
```