tcp: Merge `open_connection` into the `negotiate_connection` fn


https://github.com/paritytech/litep2p/blob/e0b7118ea2ca3e9f9beb9605f649d7e9dcdd24c4/src/transport/tcp/connection.rs#L212-L231

	/// Open connection to remote peer at `address`.
	// TODO: this function can be removed
	pub(super) async fn open_connection(
	connection_id: ConnectionId,
	keypair: Keypair,
	stream: TcpStream,
	address: AddressType,
	peer: Option<PeerId>,
	yamux_config: crate::yamux::Config,
	max_read_ahead_factor: usize,
	max_write_buffer_size: usize,
	connection_open_timeout: Duration,
	substream_open_timeout: Duration,
	) -> Result<NegotiatedConnection, NegotiationError> {
	tracing::debug!(
	target: LOG_TARGET,
	?address,
	?peer,
	"open connection to remote peer",
	);

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