LDR Tutorial & Manage LDR pages

[kathancox]

Preview:

Setup Guide
Manage LDR Ref

This PR is 1 of 4(?) for LDR docs. It contains:

• Setup Guide (tutorial) for setting up a unidirectional/bidirectional LDR stream.
• Manage LDR for understanding conflict resolution, working with the DLQ, coordinating schema changes, and job management. Also, a small section on schema validation (this should maybe move into a known limitation section when there is more content).

Reviewers: You'll see a lot of comments for follow-up PRs to connect pages with links and such.

Content pages to come:
LDR Overview
Monitoring
CREATE/SHOW sql ref
Technical Overview
LDR Metrics Dashboard docs

[github-actions]

Files changed:

• src/current/_includes/sidebar-data-v24.3.json
• src/current/_includes/v24.3/sidebar-data/cross-cluster-replication.json
• src/current/images/v24.3/bidirectional-stream.svg:
• src/current/v24.3/set-up-logical-data-replication.md
• src/current/v24.3/manage-logical-data-replication.md
• src/current/v24.3/set-up-logical-data-replication.md

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[alicia-l2]

This lgtm from an structure perspective!