feat: add PKL schema for message formats

pkg/orm/transactions/Proposal.pkl.go

@@ -0,0 +1,11 @@
+// Code generated from Pkl module `transactions`. DO NOT EDIT.
+package transactions
+
+// Base class for all proposals
+type Proposal struct {
+	// The title of the proposal
+	Title string `pkl:"title"`
+
+	// The description of the proposal
+	Description string `pkl:"description"`
+}