Adds event loop concept to INP doc.

[malchata]

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Changes proposed in this pull request:

• Adds the event loop concept and diagram to the INP doc (build preview link).
• Adds additional emphasis on long tasks.

cc: @anniesullie, @mmocny

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src/site/content/en/metrics/inp/index.md

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[malchata]

Adding the DO_NOT_MERGE label as we discuss further changes to the INP doc.

[malchata]

Closing this, as we won't be merging this content in the guide.