Connexa: a high-level abstraction over rust-libp2p

[dariusc93]

Connexa, largely inspired by rust-ipfs, is a library that is a high-level abstraction over rust-libp2p that tries to simplify the process to build out p2p applications on top of rust-libp2p. It is currently in an Alpha stage (still a WIP more or less) with things still missing and are bound to change and break but still pretty usable to large degree with examples showing how to use kad/dht, gossipsub, request-response by file sharing (which currently only encode/decode into bytes for both requests and responses, but this may change in the future to allow encoding the request and response differently), and showing how to implement your own behaviour (this may change though). All of which tries to stay close to rust-libp2p where possible.