feat: add new function instance-ssm-port-forward-remote-host

[dnafication]

Add a new command to start a port forwarding session to a remote host through an EC2 instance. The remote host isn't required to be managed by AWS Systems Manager as long as it is accessible from the EC2 instance. Reference

# USAGE: instance-ssm-port-forward-remote-host local_port_number port_number host instance-id [instance-id]

instance-ssm-port-forward-remote-host 3306 3306 database.ap-southeast-2.rds.amazonaws.com i-xxxx
Starting session with SessionId: dina-00000000000000000
Port 3306 opened for sessionId dina-00000000000000000.
Waiting for connections...

# OR chain commands

instances jumphost | instance-ssm-port-forward-remote-host 3306 3306 database.ap-southeast-2.rds.amazonaws.com
Starting session with SessionId: dina-00000000000000000
Port 3306 opened for sessionId dina-00000000000000000.
Waiting for connections...