optimizely / javascript-sdk / 2943

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feat: Added a Lite bundle excluding Data file manager and Event Processor packages. (#699)

## Summary
Some platforms (such as edge providers), do not need extended functionality offered by data file manager and event processor. This PR creates a lite bundle which uses a `NoOpDatafileManager` and a `ForwardingEventProcessor` which immediately dispatches events when a custom event dispatcher is provided. This results in up to 20% reduction in bundle size. This also fixes the errors that SDK was throwing on edge platforms.

### Usage
To use the lite bundle, user needs to explicitly import from it.
`import { createInstance } from '@optimizely/optimizely-sdk/dist/optimizely.lite.es.mins.js'`

## Test plan
1. All the Full stack compatibility suite tests pass for the existing bundles.
2. Fixed all the failing unit tests.
3. Added new unit tests to `lite` entry point.

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