[META 27] General Availability of ECS logging

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Relates: elastic/ecs-logging#27

There is an effort to make ECS logging generally available across the language ecosystems of APM agents. As part of this, the ECS projects for .NET should be checked:

• Validation against the spec
• Integrate with APM by adding trace.id and transaction.id
• Review of dependency licenses
• Documentation for the elastic.co website

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All items are checked