Export IConfigurationStore

v1.0.3

Export IConfigurationStore properly

Reverting async functionality

v1.0.2

Reverting async changes and bringing to 1.0.2

Configuration Storage is now Async (necessary for react-native)

Fixed syntax error on build

Note: It's important to run npm pack to ensure that everything
actually passes.

Refactor @eppo/js-client-sdk into shared package.

This takes the original implementation of @eppo/js-client-sdk and refactors it to support multiple javascript environments. Common provides the bulk of the functionality to support both web and react-native versions of the SDK with most code shared between them.