pubsub/messages: advice high throughput appends

[mschristensen]

Description

Adds clarifying guidance to Pub/Sub message appends docs that in high throughput use cases, consider using a realtime client for ordering guarantees.

Checklist

• Commits have been rebased.
• Linting has been run against the changed file(s).
• The PR adheres to the writing style guide and contribution guide.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch bugfix/pubsub-append-realtime-advice

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