feat: [Dlp] added support for detecting key-value pairs in document metadata (#9029)

* feat: added support for detecting key-value pairs in document metadata
feat: added support for image exclusion and adjustment rules
feat: add InfoType launch status in InfoType Description
docs: added formatting to various comments

PiperOrigin-RevId: 885724590

Source-Link: googleapis/googleapis@dfcbe68

Source-Link: googleapis/googleapis-gen@31a2776
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* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

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Author: gcf-owl-bot[bot]