fix: package.json & .snyk to reduce vulnerabilities

The following vulnerabilities are fixed with a Snyk patch:
- https://snyk.io/vuln/SNYK-JS-LODASH-567746

Author: snyk-bot

.snyk

@@ -0,0 +1,8 @@
+# Snyk (https://snyk.io) policy file, patches or ignores known vulnerabilities.
+version: v1.25.0
+ignore: {}
+# patches apply the minimum changes required to fix a vulnerability
+patch:
+  SNYK-JS-LODASH-567746:
+    - '@contentstack/datasync-manager > lodash':
+        patched: '2022-05-18T00:31:43.230Z'

package.json

@@ -6,14 +6,17 @@
   "scripts": {
     "continue": "node index.js",
     "start": "npm run clean && node index.js",
-    "clean": "rimraf .ledger .token .checkpoint unprocessible/"
+    "clean": "rimraf .ledger .token .checkpoint unprocessible/",
+    "prepublish": "npm run snyk-protect",
+    "snyk-protect": "snyk-protect"
   },
   "dependencies": {
     "@contentstack/datasync-asset-store-filesystem": "1.0.0",
     "@contentstack/datasync-content-store-filesystem": "1.0.1",
     "@contentstack/datasync-content-store-mongodb": "1.0.1",
     "@contentstack/webhook-listener": "1.0.0",
-    "@contentstack/datasync-manager": "1.2.0"
+    "@contentstack/datasync-manager": "1.2.0",
+    "@snyk/protect": "latest"
   },
   "devDependencies": {
     "eslint": "^6.1.0",
@@ -24,5 +27,6 @@
     "url": "https://github.com/contentstack/datasync-boilerplate"
   },
   "author": "Contentstack LLC <[email protected]>",
-  "license": "MIT"
+  "license": "MIT",
+  "snyk": true
 }