Add Changefeed Best Practices page to gather recommendations

[kathancox]

Fixes DOC-11618

This PR adds a page for Changefeed Best Practices. The recommendations here were already present in the documentation, but not centralized.

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[github-actions[bot]]

Files changed:

• src/current/_includes/v24.3/cdc/cdc-schema-locked-example.md:
• src/current/v24.3/changefeed-best-practices.md
• src/current/v24.3/create-changefeed.md
• src/current/_includes/v24.3/sidebar-data/stream-data.json
• src/current/v24.3/changefeed-best-practices.md
• src/current/v24.3/create-and-configure-changefeeds.md
• src/current/v24.3/create-changefeed.md
• src/current/v24.3/monitor-and-debug-changefeeds.md

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