DOC-6331 Python async intro page

[andy-stark-redis]

Note

Low Risk
Low risk docs-only change that adds a new page and example snippets; no product code paths are modified.

Overview
Adds a new redis-py documentation page, async.md, introducing asyncio usage patterns (async client setup, pooling, concurrent awaits via asyncio.gather, pipelines/transactions, pub/sub, cluster connections, cleanup, and timeouts) and linking to related resiliency docs.

Introduces a matching local_examples/.../async_intro.py example set with step-based snippets (connect, context_manager, pool, gather, pipeline, watch, pubsub, cluster, timeout) to back the new page’s clients-example shortcodes.

^{Reviewed by Cursor Bugbot for commit efe5dae. Bugbot is set up for automated code reviews on this repo. Configure here.}

[github-actions]

DOC-6631

[github-actions]

Staging links:
https://redis.io/docs/staging/DOC-6631-python-async-intro/develop/clients/redis-py/async/

[jit-ci]

🛡️ Jit Security Scan Results

✅ No security findings were detected in this PR

---

^{Security scan by Jit}

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

^{❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, have a team admin enable autofix in the Cursor dashboard.}

^{Reviewed by Cursor Bugbot for commit 32f6b1c. Configure here.}

[dwdougherty]

Just a couple of nitpicks re. US vs. UK spelling; otherwise LGTM.