Add "@types/chai" devDependency to package.json in ts template (#1512)

cli/src/template.rs

@@ -237,6 +237,7 @@ pub fn ts_package_json() -> String {
         "chai": "^4.3.4",
         "mocha": "^9.0.3",
         "ts-mocha": "^8.0.0",
+        "@types/chai": "^4.3.0",
         "@types/mocha": "^9.0.0",
         "typescript": "^4.3.5"
     }}