[RealtimeKit] Add API and SDK limits

[swapnilmadavi]

Summary

Adds a RealtimeKit Limits reference page for API and SDK rate limits.

Documentation checklist

• The change adheres to the documentation style guide.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.

[cloudflare-docs-bot]

Review

✅ No issues found in commit 6f3519b.

Code Review

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[github-actions]

Preview URL: https://6f3519bb.preview.developers.cloudflare.com
Preview Branch URL: https://smadavi-rtk-limits.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/realtime/realtimekit/limits/	https://smadavi-rtk-limits.preview.developers.cloudflare.com/realtime/realtimekit/limits/
https://developers.cloudflare.com/realtime/realtimekit/legal/	https://smadavi-rtk-limits.preview.developers.cloudflare.com/realtime/realtimekit/legal/

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