EventCountersListener enables all keywords and all log levels on enabled event sources

[davidfowl]

This leads to high CPU usage which leads to performance problems.
I'm pretty sure it's this line of code coming from the event counter to meter translation layer:

extensions/src/Libraries/Microsoft.Extensions.Telemetry/Metering.Collectors.EventCounters/EventCountersListener.cs

Line 234 in 996fcd8

EnableEvents(eventSource, EventLevel.LogAlways, EventKeywords.All, _eventSourceSettings);

It's turning on all of the keywords and all of the event verbosity.

For reference, here's the otel version:

https://github.com/open-telemetry/opentelemetry-dotnet-contrib/blob/0de8b8a2755b1c5079d369aa63203184703c00c8/src/OpenTelemetry.Instrumentation.EventCounters/EventCountersMetrics.cs#LL197C37-L197C37

We should make these match.

[xakep139]

@dpk83 FYI

[xakep139]

@davidfowl, @stephentoub since you were investigating the performance issues, can you please try the fix from #4109?
Or I can do that if you have a benchmark/solution. Thanks!