feat(OptimizelyConfig): Add new fields to OptimizelyConfig (#698)

## Summary
The following new public properties are added to OptimizelyConfig:
- sdkKey
- environmentKey
- attributes
- audiences
- events
- experimentRules and deliveryRules to OptimizelyFeature
- audiences to OptimizelyExperiment

## Test plan
All FSC tests OPTIMIZELY_CONFIG_V2 tests should pass.
FSC OptimizelyConfig [link](https://app.travis-ci.com/github/optimizely/fullstack-sdk-compatibility-suite/builds/235034135)

Author: yasirfolio3

packages/optimizely-sdk/lib/core/condition_tree_evaluator/index.ts

@@ -1,5 +1,5 @@
 /****************************************************************************
- * Copyright 2018, 2020, Optimizely, Inc. and contributors                  *
+ * Copyright 2018, 2021, Optimizely, Inc. and contributors                  *
  *                                                                          *
  * Licensed under the Apache License, Version 2.0 (the "License");          *
  * you may not use this file except in compliance with the License.         *
@@ -18,7 +18,7 @@ const AND_CONDITION = 'and';
 const OR_CONDITION = 'or';
 const NOT_CONDITION = 'not';
 
-const DEFAULT_OPERATOR_TYPES = [AND_CONDITION, OR_CONDITION, NOT_CONDITION];
+export const DEFAULT_OPERATOR_TYPES = [AND_CONDITION, OR_CONDITION, NOT_CONDITION];
 export type ConditionTree<Leaf> = Leaf | unknown[];
 
 type LeafEvaluator<Leaf> = (leaf: Leaf) => boolean | null;