evaluatorMemo cache leaks memory and DOM elements

[bep]

• The core of this issue lives in the evaluatorMemo cache:

  alpine/packages/alpinejs/src/evaluator.js

  Line 46 in 4f272c5

  let evaluatorMemo = {}

• That cache gets written to, but never deleted from.
• When values in that cache has references to a DOM element (as in the x-for example below), it effectively prevents garbage collection and leaks DOM elements and memory.

There is a example that reproduces this at https://alpine-testlab.netlify.app/leak1/ running with the latest AlpineJS -- description repeated below:

• Open the Memory profiler in Chrome
• Click the red button, all the x-for components are removed.
• Click the garbage icon in the profiler to force GC.
• Click on the round button to create a new profile.
• Filer by Detached HTMLTemplateElement

You should now see 20 detached elements. If you click on one, it points to evaluatorMemo.