[pip] PIP-455: Support Namespace Bundle Lookup and Topic Preloading

[zhaizhibo]

Motivation

Modifications

Start a PIP: Support Namespace Bundle Lookup and Topic Preloading

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

Matching PR in forked repository

PR in forked repository:

[github-actions]

@zhaizhibo Please add the following content to your PR description and select a checkbox:

- [ ] `doc` <!-- Your PR contains doc changes -->
- [ ] `doc-required` <!-- Your PR changes impact docs and you will update later -->
- [ ] `doc-not-needed` <!-- Your PR changes do not impact docs -->
- [ ] `doc-complete` <!-- Docs have been already added -->

[lhotari]

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[zhaizhibo]

@zhaizhibo Please ensure that you have subscribed to the dev mailing list (instructions). I released your email from the moderation queue.

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