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feat: datafile accessor (#535)

Summary:

Add a getDatafile method to the OptimizelyConfig object, that returns a string version of the datafile currently being used by the instance.

- toDatafile function added in project_config module to encapsulate conversion of project config to datafile string
- Parsing & validation code updated (in both optimizely-sdk and updated datafile-manager version) to only call JSON.parse at most once.

Test Plan:

Manual testing
Passing new FSC datafile accessor tests
Updated unit tests

Co-authored-by: Matt Carroll <matt.carroll@optimizely.com>
Co-authored-by: Sohail Hussain <mirza.sohailhussain@gmail.com>
Co-authored-by: muhammadnoman <muhammadnoman@folio3.com>

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