chore: add an npm script to run echidna tests

package.json

@@ -27,6 +27,7 @@
     "prepare": "husky install",
     "smock": "smock-foundry --contracts src/contracts",
     "test": "yarn test:integration && yarn test:unit",
+    "test:echidna": "find test/invariants/fuzz/  -regex '.*\\.t\\.sol$' |cut -d '/' -f 4 | cut -d . -f 1 |xargs -I{} echidna test/invariants/fuzz/{}.t.sol --contract Fuzz{} --config test/invariants/fuzz/{}.yaml",
     "test:integration": "forge test --ffi --match-path 'test/integration/**' -vvv --isolate",
     "test:local": "FOUNDRY_FUZZ_RUNS=100 forge test -vvv",
     "test:scaffold": "bulloak check --fix test/unit/*.tree && forge fmt",