feat: add initial DID implementation

pkl/txns.pkl

@@ -1,5 +1,9 @@
+@go.Package { name = "github.com/onsonr/sonr/gen/transactions" }
+
 module transactions
 
+import "package://pkg.pkl-lang.org/pkl-go/pkl.golang@0.5.0#/go.pkl"
+
 /// Common Cosmos SDK types
 typealias Coin = Dynamic
 typealias AccAddress = String