Added Redis Cache firewall resource start and end IP address validations

[ritesh-modi]

Added Redis Cache firewall resource start and end IP address validations such that the request fails at plan level rather than apply. The validations will provide feedback for invalid ip addresses during plan itself.

Details of acceptance tests

riteshmodi@MININT-3FOKASG terraform-provider-azurerm % make acctests SERVICE=redis TESTARGS='-run=TestAccAzureRMRedisFirewallRule' TESTTIMEOUT='120m'
==> Checking that code complies with gofmt requirements...
==> Checking that Custom Timeouts are used...
==> Checking that acceptance test packages are used...
TF_ACC=1 go test -v ./azurerm/internal/services/redis/tests/ -run=TestAccAzureRMRedisFirewallRule -timeout 120m -ldflags="-X=github.com/terraform-providers/terraform-provider-azurerm/version.ProviderVersion=acc"
=== RUN TestAccAzureRMRedisFirewallRule_basic
=== PAUSE TestAccAzureRMRedisFirewallRule_basic
=== RUN TestAccAzureRMRedisFirewallRule_multi
=== PAUSE TestAccAzureRMRedisFirewallRule_multi
=== RUN TestAccAzureRMRedisFirewallRule_requiresImport
=== PAUSE TestAccAzureRMRedisFirewallRule_requiresImport
=== RUN TestAccAzureRMRedisFirewallRule_update
=== PAUSE TestAccAzureRMRedisFirewallRule_update
=== CONT TestAccAzureRMRedisFirewallRule_basic
=== CONT TestAccAzureRMRedisFirewallRule_update
=== CONT TestAccAzureRMRedisFirewallRule_requiresImport
=== CONT TestAccAzureRMRedisFirewallRule_multi
--- PASS: TestAccAzureRMRedisFirewallRule_requiresImport (1324.42s)
--- PASS: TestAccAzureRMRedisFirewallRule_update (1395.16s)
--- PASS: TestAccAzureRMRedisFirewallRule_multi (1432.15s)
--- PASS: TestAccAzureRMRedisFirewallRule_basic (1491.06s)
PASS
ok github.com/terraform-providers/terraform-provider-azurerm/azurerm/internal/services/redis/tests 1491.109s

[tombuildsstuff]

LGTM - thanks for this @ritesh-modi

[ghost]

This has been released in version 2.33.0 of the provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading. As an example:

provider "azurerm" {
    version = "~> 2.33.0"
}
# ... other configuration ...

[ghost]

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