merkle tree serialization and building

- added serialization to @zk-kit/imt
- building the tree in registry and copying it to /common and /app/deployments
- factor getLeaf
- all tests passing and in-app proof gen working

circuits/package.json

@@ -10,9 +10,9 @@
     "@types/chai-as-promised": "^7.1.6",
     "@types/node": "^20.6.3",
     "@types/node-forge": "^1.3.5",
-    "@zk-kit/imt": "^2.0.0-beta",
     "@zk-email/circuits": "^3.2.2",
     "@zk-email/helpers": "^3.1.3",
+    "@zk-kit/imt": "https://gitpkg.now.sh/0xturboblitz/zk-kit/packages/imt?6d417675",
     "chai-as-promised": "^7.1.1",
     "circom_tester": "^0.0.20",
     "circomlib": "^2.0.5",