Batch Download of resources.

[aditya-07]

Describe the bug Define a useful way for developer apps to be able to sync resources efficiently using available FHIR apis and also be able to figure out resources that need to be purged because user doesn't have access to them anymore or they are deleted from the server.

Component Core library, reference app,

To Reproduce Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior A clear and concise description of what you expected to happen.

Screenshots If applicable, add screenshots to help explain your problem.

Smartphone (please complete the following information):

• Device: [e.g. Pixel4a emulator]
• Android version: [e.g. Settings -> About phone -> Android version]
• Build number: [e.g. Settings -> About phone -> Build number]
• Version [e.g. 22]

Additional context Add any other context about the problem here.

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