Add picture support

[mattwalo32]

We should add a field that allows users to take a picture of the patient and view it on the dashboard.

[mattwalo32]

Create a new picture field. Here are the steps involved in adding any new field

1. In the backend constants.js, make sure your field exists in fieldEnum. In your case, PHOTO already exists, so nothing to do.

2. In the frontend constants.js, make sure your field exists in FIELD_TYPES. When you add the field, make sure the value exactly matches whats on the backend.

3. Now we need to define what data is actually going to be stored in this field in the backend. I think we don't need to do anything special here.... the value can just be an array of file schemas, just like our fieldEnum.FILE type. Go into generateFieldSchema in metadata.js and add a case for fieldEnum.PHOTO where you define what the schema will look like.

4. Now you can get to the bulk of the work on the frontend. Create a new PhotoField component in the Fields folder on the frontend. Then go into StepField.js and add a case for the photo where you return your new photo field. So now if you encounter a step with a fieldType of PHOTO, your component will be rendered!

Here's some things I'd recommend:

• When you get to creating the component for the frontend, I'd first make an empty component with a log statement, and get it all hooked up in StepField.js. Then to make sure you got everything done right, go into mongoDB atlas and create a new field (in any step) with a fieldType of PHOTO. If you restart your backend, if everything was done right, then when you view the step with the photo field, your log statement should print. Then from there, you can start writing your component and you'll actually be able to see it. Let me know if you need help with the mongo DB part.
• Look at other components in Fields to get an idea of how your component should be structured.
• Remember, don't start on this until #274 is closed, or git is not gonna be happy. Also when I'm mentioning all these file names, I'm not looking at master, I'm looking at #274

[mattwalo32]

Closing to split this into two smaller tasks