add slither github action to fail on new errors

.github/workflows/static-analysis.yml

@@ -58,4 +58,4 @@ jobs:
         working-directory: ./packages/contracts
         shell: bash
         run: yarn test:slither
-        continue-on-error: true
+        continue-on-error: false

packages/contracts/slither.config.json

@@ -5,8 +5,8 @@
   "exclude_medium": false,
   "exclude_high": false,
   "solc_disable_warnings": false,
-  "hardhat_ignore_compile": true,
+  "hardhat_ignore_compile": false,
   "disable_color": false,
-  "exclude_dependencies": true,
+  "exclude_dependencies": false,
   "filter_paths": "@openzeppelin|hardhat|contracts/test-helpers|contracts/test-libraries"
 }