chore: Add performance regression test for TrackedArray

[MichalBryxi]

Crux

• Fix for performance issue on calling new TrackedArray().splice().

Performance tests

• Regression check to make sure TrackedArray is performant enough when calling splice.
• If controlWindow goes down to zero, we need to artificially bump it to non-zero value (read: 1).
• This is because it would be impossible to beat zero ms with any code that has some overhead.
• The number of iterations being 10k still yields 16ms (M1) and 41ms (Intel)

Other tests

• Added other assertions to make sure we're testing real data and that we don't mutate the initial data set as we go.

TODOs

• [ ] Add slice in the ARRAY_GETTER_METHODS 1
• [ ] Resolve question about splice return value being tracked 2

Relates to: #405

[MichalBryxi]

Note: this PR is based on this discussion and at the moment it should fail as we're in known non-performant situation. This is merely to track the situation and see when we get to a better place.

[lifeart]

Possible fix here (gives only 2.3-3x regression, instead of 100x) (inspired by https://github.com/vuejs/vue/blob/bed04a77e575d6c4c1d903f60087dca874f7213e/src/core/observer/array.ts#L17)

addon/src/-private/array.ts

    return new Proxy(clone, {
      get(target, prop /*, _receiver */) {
        let index = convertToInt(prop);
+        if (prop === 'splice') {
+          return (...args) => {
+            try {
+              return new TrackedArray(target.splice(...args));
+            } finally {
+              setValue(self.#collection, null);
+            }
+          };
        }

[MichalBryxi]

Oh wow, with your change I'm getting for 10M items:

Before (best case) = 2953ms After (worst case) = 7.89ms

So if i can potato with math, it's 374.2x improvement 🤯