@moq/signals improvements

[kixelated]

Warn on .set if we provide the same reference as before for non-primatives. Means we'll have to wrap references with a Signals.ref helper or something.

Export functions instead of classes to improve tree shaking? Maybe as a /lite path.

Use the TC39 or whatever Signal proposal.

[coderabbitai]

🔗 Related PRs

#630 - Use a symbol instead of instanceof for Signal checking. [merged]
#671 - IETF: Improve moq-clock subscriber. [merged]
#979 - Update signals, adding new helpers [merged]
#1088 - Fix Signal equality: use === for class instances, dequal for plain objects [merged]
#1276 - Use Command signal for reactive track fanout in moq-boy [merged]

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