[Feature] Add Statsbeat Network data collection

[xiao-lix]

TODOs and FYI:

1. Need to discuss what count as exceptions on web. eg. Do we want to count all throwInternals as exception for statsbeat?
2. Need to add more config check, eg. sample rate. Now only checks if it's disabled by user.
3. For telemetries sent by Web SDK, all envelops have a name with such format: Microsoft.ApplicationInsights.<ikey>.Metric. This seems too long for statsbeat, but it's required by the SDK if I understand correctly. Reference here.
4. For Web SDK, Network statsbeat are sent as a single telemetry (eg. countRequest, countRetry, countException, etc), the counts are put in custom dimensions - data.baseData.properties. Thus the queries to get statsbeat data from Web SDK will be different.

A sample payload:

[lzchen]

Shouldn't averageRequestExecutionTime be the one that should be checked for negative?

[xiao-lix]

@hectorhdzg can you please help here thanks! Should it be different from node sdk?

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