Improve docs for raw tables

[simolus3]

This:

1. Removes a concrete example for raw tables from the changelog - the feature is more complicated than that and requires e.g. custom triggers to detect local writes. So it's better to link to the upcoming docs page.
2. Explicitly mentions that the Rust client is required for raw tables.
3. Issues a warning log if the JS client is used with raw tables.

[changeset-bot]

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Latest commit: 92f8c5b

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Name	Type
@powersync/common	Minor
@powersync/node	Minor
@powersync/web	Minor
@powersync/react-native	Minor
@powersync/op-sqlite	Patch
@powersync/tanstack-react-query	Patch
@powersync/diagnostics-app	Patch

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