fix: add Position to RulesetRule

This will allow to update position of a specific rule in PATCH:

* fixes: cloudflare#1938
* https://developers.cloudflare.com/ruleset-engine/rulesets-api/update-rule/#change-the-order-of-a-rule-in-a-ruleset

rulesets.go

@@ -660,6 +660,7 @@ type RulesetRule struct {
 	RateLimit              *RulesetRuleRateLimit              `json:"ratelimit,omitempty"`
 	ExposedCredentialCheck *RulesetRuleExposedCredentialCheck `json:"exposed_credential_check,omitempty"`
 	Logging                *RulesetRuleLogging                `json:"logging,omitempty"`
+	Position               *RulesetRulePosition               `json:"position,omitempty"`
 }
 
 // RulesetRuleRateLimit contains the structure of a HTTP rate limit Ruleset Rule.
@@ -674,6 +675,13 @@ type RulesetRuleRateLimit struct {
 	RequestsToOrigin        bool     `json:"requests_to_origin,omitempty"`
 }
 
+// RulesetRulePositon contains the structure of a Ruleset Rule position.
+type RulesetRulePosition struct {
+	Index  int    `json:"index,omitempty"`
+	Before string `json:"before,omitempty"`
+	After  string `json:"after,omitempty"`
+}
+
 // RulesetRuleExposedCredentialCheck contains the structure of an exposed
 // credential check Ruleset Rule.
 type RulesetRuleExposedCredentialCheck struct {