New docs for Log Formatter APIs

[shirhatti]

Describe the new topic

dotnet/runtime#38616 adds a few new features to ILogger:

• A new in-box JSON format for Console logs
• Support for custom log formatters

Explain why this topic is needed.

In environments where folks scrape/redirect console logs for structured logging, they want to know how to enable JSON formatted logs

Suggest a location in the Table of Contents.

https://docs.microsoft.com/aspnet/core/fundamentals/logging/

Write an abstract. In one short paragraph, describe what this topic will cover.

Console log formatting APIs

The Console Logger provides built-in formatters and the ability author your own custom formatter.

Create an outline for the new topic. We'll help review the outline and approve it before anyone writes a topic.

• What is a console log formatter?
• What are the in-box console log formatters?
  • Simple
  • JSON
  • SystemD
  • Compact
• How do register a new formatter?
• How do I select which formatter to use (via both code and config)?
• How do I author a new formatter?

@maryamariyan

[Rick-Anderson]

@shirhatti @maryamariyan can you suggest someone to prove code samples and the first draft?

[maryamariyan]

@Rick-Anderson I can help out.

[shirhatti]

Closing this issue as it was addressed in dotnet/docs#21189