[Feature Request] Port forwarding to Login nodes from the Load Balancer

[mapk-amazon]

Currently

PCluster creates for login nodes (pools) an Elastic Load Balancer (NLB) with:

• A target group encompassing the login nodes for Port 22, TCP
• A listener for port 22, TCP

Request

Enable customization for this. For each pool add the key "LoadBalancers" is a list of "LoadBalancer", having two keys "Type" and "PortForwardings". "Type" is either ALB or NLB for the type of load balancer. PortForwardings is a list of a "Portfowarding" class, having the keys:

• SourcePort, Integer, Required, Constraint: >= 0
• TargetPort, Integer, Required, Constraint: >= 0
• Protocol, String, Required, Constraint: [TCP, UDP]
• Certificate: String, optional, Constraint: ARN of certificate in ACM, default: None
• Stickiness: Boolean, optional, default: false

With those information, PCluster will set up the target groups and listeners, populated with the values provided.