Introduces the ability to make objects and array changes reactive by "tracking" them

[cesarParra]

Background

This PR introduces reactive signals to complex Javascript objects and arrays. Now, there is an option to react (through a computed or effect) if the value within a signal object changes, or if a signal array's values changes (through a push, pop, splice, etc. for example).

Summary

To improve that experience, you can now set a track flag when creating the signal. When set to true, this will make the signal reactive to changes in the object or array properties.

📒 Think about this as using the @track decorator in LWC properties. It works the exact same way behind the scenes.

import { $signal } from "c/signals";

const obj = $signal({ x: 1, y: 2 }, { track: true });
const computedFromObj = $computed(() => obj.value.x + obj.value.y);

// When a value in the object changes, the computed value will automatically update
obj.value.x = 2;

console.log(computedFromObj.value); // 4

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Checklist

• Port the Observable Membrane codebase
• Integrate with signals
• UTs
• Configurable option track explicitly
• Clean up the observable membrane's TODOs
• Remove any Node references
• Examples updates
• Docs