fix: allow snake case keys for ip based rate limit config entry (#19277)

* fix: allow snake case keys for ip based rate limit config entry

* chore: add changelog

.changelog/_7406.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+server: **(Enterprise Only)** Fixed an issue where snake case keys were rejected when configuring the control-plane-request-limit config entry
+```

api/config_entry_rate_limit_ip.go

@@ -4,8 +4,8 @@
 package api
 
 type ReadWriteRatesConfig struct {
-	ReadRate  float64
-	WriteRate float64
+	ReadRate  float64 `alias:"read_rate"`
+	WriteRate float64 `alias:"write_rate"`
 }
 
 type RateLimitIPConfigEntry struct {
@@ -16,8 +16,8 @@ type RateLimitIPConfigEntry struct {
 
 	Meta map[string]string `json:",omitempty"`
 	// overall limits
-	ReadRate  float64
-	WriteRate float64
+	ReadRate  float64 `alias:"read_rate"`
+	WriteRate float64 `alias:"write_rate"`
 
 	//limits specific to a type of call
 	ACL             *ReadWriteRatesConfig `json:",omitempty"` //	OperationCategoryACL             OperationCategory = "ACL"