build: move mongodb to optional peer dependencies

BREAKING CHANGE: if needed mongodb needs to be installed as a peer

Author: lukashass

package.json

@@ -26,9 +26,6 @@
     "test:watch": "yarn test --watch",
     "release": "semantic-release"
   },
-  "dependencies": {
-    "mongodb": "3.6.10"
-  },
   "devDependencies": {
     "@geprog/eslint-config": "0.0.1",
     "@jest/types": "26.6.2",
@@ -44,6 +41,7 @@
     "eslint": "7.29.0",
     "jest": "26.6.3",
     "jest-junit": "12.2.0",
+    "mongodb": "3.6.10",
     "prettier": "2.3.1",
     "rollup": "2.52.2",
     "rollup-plugin-dts": "3.0.2",
@@ -53,6 +51,14 @@
     "ts-node": "10.0.0",
     "typescript": "4.2.4"
   },
+  "peerDependencies": {
+    "mongodb": "^3.6.0"
+  },
+  "peerDependenciesMeta": {
+    "mongodb": {
+      "optional": true
+    }
+  },
   "publishConfig": {
     "access": "public"
   }