JSON RPC over IPC should support multiple simultaneous clients

[mralj]

Is your feature request related to a problem? Please describe.
The way the JsonRpcIpcRunner is implemented now doesn't allow multiple simultaneous clients to be connected. This is because in accept connection loop we do the following

while (true)
{
    if (_logger.IsInfo) _logger.Info("Waiting for an IPC connection...");

    Socket socket = await _server.AcceptAsync(cancellationToken);

    socket.ReceiveTimeout = _jsonRpcConfig.Timeout;
    socket.SendTimeout = _jsonRpcConfig.Timeout;

    using JsonRpcSocketsClient<IpcSocketMessageStream>? socketsClient = new(
        string.Empty,
        new IpcSocketMessageStream(socket),
        RpcEndpoint.IPC,
        _jsonRpcProcessor,
        _jsonRpcLocalStats,
        _jsonSerializer,
        maxBatchResponseBodySize: _jsonRpcConfig.MaxBatchResponseBodySize);

    await socketsClient.ReceiveLoopAsync();
}

The issue is the line await socketsClient.ReceiveLoopAsync(); because as long as we are serving one client, we cannot accept others.

Describe the solution you'd like
To be able to use JSON RPC over IPC/UnixDomainSockets with multiple clients simultaneously.

Additional context
Additionally the way this whole section is written, more specifically thanks to this call to Dispose if the client Disconnects in erroneous way the whole IPC is shut down and no more clients are able to connect unless the node is restarted.