Import libp2p-crypto dependants directly

[dapplion]

This library depends and imports from libp2p-crypto which hosts multiple crypto libs and utils. Since noise only requires a subset of those, should this library skip the libp2p-crypto middleman and import strictly what's necessary directly @achingbrain ?

Related: libp2p/js-libp2p-crypto#215

[achingbrain]

This sounds appealing but it would make it much easier to end up with multiple versions of dependencies and/or competing implementations of the same algorithms which would increase bundle sizes when libp2p-* modules are packaged up for the browser, plus you still have it as a transitive dependency through peer-id.

Looking into the code here, libp2p-crypto is only used in non-test code to verify the payload of incoming messages - you could use the pubKey property on the incoming peerId to do the same thing. Then you could make libp2p-crypto a dev dep - eg: #115

[wemeetagain]

resolved with #116