Binder: Throw an error on signal value() called without effect

[tltv]

For cases where a field component is not available, including binder-level validators, we should instead run the callback with a custom signal dependency tracker that throws an error if any signal value is read to make the developer aware that there's unexpectedly no effect in that particular case. Support for the cases without a field component would require handling all validation status changes as computed signals instead of as effects. Refactoring Binder to work in that way is outside the scope of this ticket.

(Parent ticket describes full context.)

[Legioth]

That's probably something along the lines of this

UsageTracker.track(() -> {
  doTheActualThing();
}, usage -> {
  throw new IllegalStateException("Helpful message here");
});

That track method overload currently returns void so we can change it to return a value from the task if necessary.

[tltv]

Merged into the parent PR.