dynatrace_web_application has a cumbersome way to add multiple IP addresses within monitoring_settings

[nmarchini]

**Is your feature request related to a problem?

I want to exclude all the Dynatrace Public Synthetic locations from the Web Application Capturing, to do this in terraform I need to first use the API to query each locations to bring back the IP addresses and then construct a very ugly piece of code like this

  monitoring_settings {
    ip_address_restriction_settings {
      mode = "EXCLUDE"
      restrictions {
        range {
          address  = "1.1.1.1"
        }
        range {
          address  = "1.1.1.2"
        }
        range {
          address  = "1.1.1.3"
        }
        range {
          address  = "1.1.1.4"
        }
        range {
          address  = "1.1.1.5"
        }
        range {
          address  = "1.1.1.6"
        }
        range {
          address  = "1.1.1.2"
        }
        range {
          address  = "1.1.1.2"
        }
        range {
          address  = "1.1.1.2"
        }
        range {
          address  = "1.1.1.2"
        }
      }
    }

This cumbersome when the list of IP addresses is many, I have ~50 to account for

Describe the solution you'd like

1. I would like to be able to pull all the IP addresses for a Dynatrace Public Synthetic location using the locaiton ID. Use the returned IP addresses in the code without having to type them out.

data "dynatrace_synthetic_locations" "all" {}

locals {
  synthetic_ips = flatten([
    for location in data.dynatrace_synthetic_locations.all.locations : location.ips
  ])
}

resource "dynatrace_web_application" "example" {
  name                                 = "example"
  type                                 = "AUTO_INJECTED"
  cost_control_user_session_percentage = 100
  load_action_key_performance_metric   = "VISUALLY_COMPLETE"
  real_user_monitoring_enabled         = true
  xhr_action_key_performance_metric    = "VISUALLY_COMPLETE"

  monitoring_settings {
    ip_address_restriction_settings {
      mode = "EXCLUDE"
      restrictions {
        range {
          for_each = toset(local.synthetic_ips)
          address  = each.value
        }
      }
    }
}

2. Be able to use for_each within ip_address_restriction_settings that calls a list of IPs from locals if we have a lot of IPs to exclude that are not Dynatrace IPs
3. Create a separate resource dynatrace_web_application_restricted_ips that allows us to use for_each on that resource

locals {
  synthetic_ips = [
    "157.175.133.173",
    "157.175.121.164",
    "157.175.6.178",
    "15.185.69.56",
    "15.185.49.140",
    "157.175.8.204",
    "15.185.79.211",
    "157.175.28.149"
  ]
}

resource "dynatrace_web_application_restricted_ips" "sephora_me_ips" {
  for_each = toset(local.synthetic_ips)
  web_application_id = dynatrace_web_application.sephora_me.id
  address            = each.value
}

Describe alternatives you've considered
I have to write out each IP address manually and it's very ugly and I have to keep checking if the Dynatrace Synthetic Public Ip have changed

Additional context
Add any other context or screenshots about the feature request here.