client: customize dynamic port range

[prestonp]

Adds new configuration option to NetworkResource called dynamic_port_range for #1087.
This allows tasks to optionally override the default port range of 20000-32000.

[hashicorp-cla]

All committers have signed the CLA.

[greut]

I'm throwing ideas in the air, but could it be something like static but accepting a list of ranges.

port "http" {}
port "https" {
  ranges = ["443","8443","4000-5000"]
}
port "lb" {
  static = "8889"
}

[notnoop]

thank you @prestonp ! I see that this is getting superseded by #8478 . Closing this one and will review that PR. Thanks!

[github-actions]

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