Support object and array as params for JsonRPC

[rtm516]

It looks like at somepoint today Mojang changed the params sent with JsonRPC from array to object, this fixes that while maintaing support for the old array

Error snippet from before the change (grabbed from Discord)

Error processing signaling frame: {"jsonrpc":"2.0","id":25,"method":"Signaling_ReceiveMessage_v1_0","params":{"From":"9121ea2b-f1c9-09ed-9596-7b8799cf0e0b","Message":"{\u0022params\u0022:{\u0022netherNetId\u0022:\u00227950929283017628844\u0022,\u0022message\u0022:\u0022CANDIDATEADD 2853288392834253181 candidate:1907536085 1 udp 41885695 XXX.XXX.XXX.XXX 51743 typ relay raddr YYY.YYY.YYY.YYY rport 50244 generation 0 ufrag Go7\u002B network-id 1 network-cost 50\u0022},\u0022jsonrpc\u0022:\u00222.0\u0022,\u0022method\u0022:\u0022Signaling_WebRtc_v1_0\u0022}","Id":"14a3dd88-a9bc-45b2-b7f6-cbc0e678b09d"}}�[m�[m
java.lang.ClassCastException: class com.google.gson.JsonObject cannot be cast to class com.google.gson.JsonArray (com.google.gson.JsonObject and com.google.gson.JsonArray are in unnamed module of loader 'app')
	at com.google.gson.JsonObject.getAsJsonArray(JsonObject.java:211) ~[MCXboxBroadcastStandalone.jar:?]
	at dev.kastle.netty.channel.nethernet.signaling.NetherNetXboxRpcSignaling.handleRequest(NetherNetXboxRpcSignaling.java:127) ~[MCXboxBroadcastStandalone.jar:?]
	at dev.kastle.netty.channel.nethernet.signaling.NetherNetXboxRpcSignaling.channelRead0(NetherNetXboxRpcSignaling.java:85) [MCXboxBroadcastStandalone.jar:?]
	at dev.kastle.netty.channel.nethernet.signaling.NetherNetXboxRpcSignaling.channelRead0(NetherNetXboxRpcSignaling.java:23) [MCXboxBroadcastStandalone