Improve ephemeral walker (#1877)

* `non_indexed::walk` as `impl Stream`

* wip

* this is gooooood

* savepoint

* remove

* Batched stream

* `unsafe_streamed_query`

* nightmare nightmare nightmare nightmare nightmare nightmare

* JS Mutex

* cleanup

* proper error handling

* myCode satisfies Typescript

* Move to npm fork of rspc

* fixes

* rspc more crashy crashy

* Typescript is very disappointed
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