feat: make reaction action and schema into enums

proto/message_contents/content_types/reaction.proto

@@ -5,6 +5,21 @@ package xmtp.reactions;
 option go_package = "github.com/xmtp/proto/v3/go/reactions";
 option java_package = "org.xmtp.proto.reactions";
 
+// Action enum to represent reaction states
+enum ReactionAction {
+  ACTION_UNSPECIFIED = 0;
+  ACTION_ADDED = 1;
+  ACTION_REMOVED = 2;
+}
+
+// Schema enum to represent reaction content types
+enum ReactionSchema {
+  SCHEMA_UNSPECIFIED = 0;
+  SCHEMA_UNICODE = 1;
+  SCHEMA_SHORTCODE = 2;
+  SCHEMA_CUSTOM = 3;
+}
+
 // Reaction message type
 message Reaction {
   // The message ID being reacted to
@@ -14,12 +29,12 @@ message Reaction {
   // Optional for group messages
   string reference_inbox_id = 2;
 
-  // The action of the reaction (e.g., "added" or "removed")
-  string action = 3;
+  // The action of the reaction (added or removed)
+  ReactionAction action = 3;
 
   // The content of the reaction 
   string content = 4;
 
-  // The schema of the reaction content (e.g., "unicode", "shortcode", "custom")
-  string schema = 5;
+  // The schema of the reaction content
+  ReactionSchema schema = 5;
 }