build(ag-trade): add cosmjs deps for smartWallet

NOTE: using the exact versions from finquick worked,
but just doing `yarn add X` for these packages resulted
in

RemoteTypeError(error:captp:Endo#20001)#1: Cannot assign to read only
property 'constructor' of object '[object Object]'

and I couldn't find any more stack info

packages/ag-trade/package.json

@@ -35,7 +35,13 @@
     "test:xs": "exit 0"
   },
   "dependencies": {
-    "@endo/far": "^1.0.1"
+    "@agoric/cosmic-proto": "^0.3.0",
+    "@cosmjs/crypto": "^0.31.3",
+    "@cosmjs/encoding": "^0.31.3",
+    "@cosmjs/proto-signing": "^0.31.3",
+    "@cosmjs/stargate": "^0.31.3",
+    "@endo/far": "^0.2.21",
+    "@endo/marshal": "^1.0.1"
   },
   "devDependencies": {
     "@endo/init": "^1.0.1",