[go_router_builder]Update the way to pass the `extra` param in router_config

[hangyujin]

issue: https://github.com/flutter/flutter/issues/111837

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• [x] I listed at least one issue that this PR fixes in the description above.
• [x] I updated pubspec.yaml with an appropriate new version according to the pub versioning philosophy, or this PR is exempt from version changes.
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• [ ] I updated/added relevant documentation (doc comments with ///).
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[flutter-dashboard[bot]]

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If you are not sure if you need tests, consider this rule of thumb: the purpose of a test is to make sure someone doesn't accidentally revert the fix. Ask yourself, is there anything in your PR that you feel it is important we not accidentally revert back to how it was before your fix?

Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing.

[stuartmorgan]

@hangyujin What's the status of this PR? Are you planning on updating it based on the discussion above?

[chunhtai]

(triage) @hangyujin said she will come back to this pr soon.