Field Type Validation when updating/setting objects in Firebase

[akapur99]

As discussed in this thread: #24 (comment)
We need to be more defensive when adding/updating objects in firebase.
First, we need to add more checks and tests to ensure invalid data is not allowed to be passed into firebase, and if it is, errors should be thrown/logged.

Tasks:

• Ensure firebase security rules are in place
• Potentially have an internal validator to validate any objects passed into firebase repository methods
• Ensure if invalid fields/values are passed in, errors are being logged thrown.