✨ Improve WebSocket connections

[GabrielePicco]

Improve WebSocket connections

Status	Type	⚠️ Core Change	Issue
Ready	Feature/Bug	No	#182 #183 #184

Problem

See #182, #183 and #184

Solution

Issues described in #184 are due registering to accounts before the websockets connection is open.

Added an event OnWebSocketConnect which can be used to await ws connection and register to accounts afterward:

void Start(){
    Web3.OnWebSocketConnect += OnWebSocketConnect;
}

private async void OnWebSocketConnect()
{
    await Web3.WsRpc.SubscribeAccountInfoAsync(new Account().PublicKey, 
        (sub, accountInfo) =>
    {
        Debug.Log($"AccountInfo: {accountInfo}");
    });
}

See: magicblock-labs/Solana.Unity-Core#47 for AutoReconnect and other improvements

Issues

Closes #184
Closes #182
Closes #183