refactor: Made react native dependencies optional (#735)

## Summary
Made the following dependencies optional in `datafile-manager` and `event-processor` packages.
`@react-native-community/async-storage`
`@react-native-community/netinfo`

## Test Plan
- Manually tested thoroughly
- All tests pass

Author: shaharyar123

packages/datafile-manager/package-lock.json

@@ -52,7 +52,7 @@
     "@optimizely/js-sdk-utils": "^0.4.0",
     "decompress-response": "^4.2.1"
   },
-  "peerDependencies": {
+  "optionalDependencies": {
     "@react-native-async-storage/async-storage": "^1.2.0"
   },
   "scripts": {

packages/datafile-manager/package.json

@@ -51,7 +51,7 @@
     "ts-jest": "^23.10.5",
     "typescript": "^4.0.3"
   },
-  "peerDependencies": {
+  "optionalDependencies": {
     "@react-native-community/netinfo": "5.9.4",
     "@react-native-async-storage/async-storage": "^1.2.0"
   }