Refactor directory structure

[doneill]

Description

Move existing source into v1 directory structure to support future versions

Fixes

#19

Proposed Changes

• Moved existing source into v1 directory structure
• Updated library entry points
• Update tests

Testing

• Run yarn test
  • Verify all tests pass
• Build and link library in React Native app

# build
npm run build

# link
yarn link

# In React Native client app, e.g. EarthRanger
yarn remove @earthranger/react-native-jsonforms-formatter
yarn link @earthranger/react-native-jsonforms-formatter