feat(cloudsql-instance): Add query insights config (#1520)

modules/cloudsql-instance/variables.tf

@@ -99,6 +99,17 @@ variable "flags" {
   default     = null
 }
 
+variable "insights_config" {
+  description = "Query Insights configuration. Defaults to null which disables Query Insights."
+  type = object({
+    query_string_length     = optional(number, 1024)
+    record_application_tags = optional(bool, false)
+    record_client_address   = optional(bool, false)
+    query_plans_per_minute  = optional(number, 5)
+  })
+  default = null
+}
+
 variable "ipv4_enabled" {
   description = "Add a public IP address to database instance."
   type        = bool