Add @microsoft/feature-management-applicationinsights-browser package

[zhiyuanliang-ms]

Usage:

import { ApplicationInsights } from "@microsoft/applicationinsights-web"
import { FeatureManager, ConfigurationObjectFeatureFlagProvider } from "@microsoft/feature-management";
import { trackEvent, createTelemetryPublisher } from "@microsoft/feature-management-applicationinsights-browser";

const appInsights = new ApplicationInsights({ config: {
    connectionString: CONNECTION_STRING
}});
appInsights.loadAppInsights();

const publishTelemetry = createTelemetryPublisher(appInsights);
const provider = new ConfigurationObjectFeatureFlagProvider(jsonObject);
const featureManager = new FeatureManager(provider, {onFeatureEvaluated: publishTelemetry});

// FeatureEvaluation event will be emitted when a feature flag is evaluated
featureManager.getVariant("TestFeature", {userId : TARGETING_ID}).then((variant) => { /* do something*/ });

// Emit a custom event with targeting id attached.
trackEvent(appInsights, TARGETING_ID, {name: "TestEvent"}, {"Tag": "Some Value"});