chore: add processor rules

Author: anssari1

customizations/generator/openapi/src/main/resources/post-processor/assets/rules/available-time-slot/change-builder-method-param-type.yaml

@@ -0,0 +1,8 @@
+rule:
+  kind: user_type
+  inside:
+    kind: parameter
+    regex: dateTime
+    stopBy:
+      kind: class_declaration
+      regex: Builder

customizations/generator/openapi/src/main/resources/post-processor/assets/rules/available-time-slot/change-class-param-type.yaml

@@ -0,0 +1,11 @@
+rule:
+  kind: user_type
+  pattern: $TYPE
+  inside:
+    any:
+      - kind: class_parameter
+        regex: dateTime
+      - kind: nullable_type
+        inside:
+          kind: class_parameter
+          regex: dateTime