feat: digest processor

[waynexia]

What's Changed in this PR

Describe the change in this PR

Closes #1454

Introduce the digest processor in pipeline

Checklist

• Please confirm that all corresponding versions of the documents have been revised.
• Please ensure that the content in sidebars.ts matches the current document structure when you changed the document structure.
• This change requires follow-up update in localized docs.

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Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

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docs/user-guide/logs/pipeline-config.md:495

• The list items under presets should be indented with two spaces for consistency.

- `presets`: A list of preset patterns to remove. The following patterns are supported: