dotnet-libp2p as nuget packages

[flcl42]

The solution includes:

• several protocols made as separate projects;
  • Libp2p.Protocols.Gossipsub (let's rename to Libp2p.Protocols.Pubsub)
  • Libp2p.Protocols.IpTcp
  • Libp2p.Protocols.IpfsId
  • Libp2p.Protocols.MDns
  • Libp2p.Protocols.MultiAddrBasedSelector
  • Libp2p.Protocols.Multistream
  • Libp2p.Protocols.Noise
  • Libp2p.Protocols.Plaintext
  • Libp2p.Protocols.Quic
  • Libp2p.Protocols.Yamux
• core types that make able to develop a protocol stack;
  • Libp2p.Core
  • Libp2p.Generators.ProtobufGenerator
• libp2p setup - a library that aggregates protocols and registers services needed for a libp2p based application.
  • Libp2p.Builder.Libp2pPeer (let's rename to Libp2p.Stack)

Let's make them separate packages available for usage as nugets.

Let's consider semver