Absorb exceptions thrown in the JSON-RPC callback

[tomaka]

Close #2521

This was an overlook. If the user uses throw in a callback (or, more likely, something accidentally throws), the exception will propagate through the smoldot VM and act as if smoldot had crashed.
We don't want that to happen.

[mergify]

Automatically approving tomaka's pull requests. This auto-approval will be removed once more maintainers are active.

[tomaka]

Note that I'm absorbing exceptions at this level rather than in the callback called by the Wasm VM, because if a callback called by the Wasm VM throws an exception it indicates a bug in the smoldot JS code, in which case it isn't wrong to crash smoldot.

[github-actions]

twiggy diff report

Difference in .wasm size before and after this pull request.

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[melekes]

👍