Gets information about a channel. Return: ~ Dictionary describing a channel, with these keys: • "id" Channel id. • "argv" (optional) Job arguments list. • "stream" Stream underlying the channel. • "stdio" stdin and stdout of this Nvim instance • "stderr" stderr of this Nvim instance • "socket" TCP/IP socket or named pipe • "job" Job with communication over its stdio. • "mode" How data received on the channel is interpreted. • "bytes" Send and receive raw bytes. • "terminal" |terminal| instance interprets ASCII sequences. • "rpc" |RPC| communication on the channel is active. • "pty" (optional) Name of pseudoterminal. On a POSIX system this is a device path like "/dev/pts/1". If the name is unknown, the key will still be present if a pty is used (e.g. for conpty on Windows). • "buffer" (optional) Buffer with connected |terminal| instance. • "client" (optional) Info about the peer (client on the other end of the RPC channel), if provided by it via |nvim_set_client_info()|.