Implement more JSON-RPC Transports

[msgilligan]

Currently supported on master:

• JsonRpcClientJavaNet: HTTP using java.net.http.HttpClient
• JsonRpcClientHttpUrlConnection: HTTP using java.net.HttpURLConnection (to be deprecated?)

PRs:

• UNIX domain sockets: PR Create UNIX sockets JsonRpc client/server #78

To be implemented:

• TCP (for Electrum Protocol, etc)
• REST (for CLN Rest protocol)
• WebSocket (for Minecraft etc)