Add support for producing Event Source based counters in .NET Core #523
Description
Based on discussions in #382 , it would be a good idea to introduce support for EventSource based EventCounters in Microsoft.Data.SqlClient for .NET Core.
EventCounters are supported in all OS platforms - Windows, Linux, and macOS. It can be thought of as a cross-platform equivalent for the PerformanceCounters that is only supported in Windows systems.
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