add getQueryData

[edrickleong]

Closes: https://github.com/blitz-js/blitz/issues/3490

What are the changes and their implications?

A new function getQueryData will be exposed.

Feature Checklist

• [x] Integration test added (see test docs if needed)
• [x] Documentation added/updated (https://github.com/blitz-js/blitzjs.com/pull/721)

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: b589eb63d8809b4881e12c1d6ba6800d8a3482c8

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 7 packages

Name	Type
@blitzjs/rpc	Patch
@blitzjs/next	Patch
@blitzjs/auth	Patch
@blitzjs/codemod	Patch
@blitzjs/config	Patch
@blitzjs/generator	Patch
blitz	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[blitzjs-bot]

Added @edrickleong contributions for doc, code and test