Add support for catchall with new router (#38439)
Add support for catchall with new router (#38439)

Adds support for `[...slug]` dynamic segments.

I found there's an inconsistency in query/params providing and added a quick fix for it now. Will update the handling in a follow-up PR to ensure it's consistently providing dynamic params outside of `query`.

Follow-up of #37551 and #38415.


## Bug

- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have helpful link attached, see `contributing.md`

## Documentation / Examples

- [ ] Make sure the linting passes by running `pnpm lint`
- [ ] The examples guidelines are followed from [our contributing doc](https://github.com/vercel/next.js/blob/canary/contributing.md#adding-examples)

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