circular import between @ember/object/index and @ember/object/observable

[patricklx]

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🐞 Describe the Bug

there is a circular import between '@ember/object/index'; and '@ember/object/observable'; and @ember/array/index.

those files are actually also importing from @ember/-internals/metal, so they could use that directly to access get, set

https://github.com/emberjs/ember.js/blob/main/packages/%40ember/object/observable.ts#L14 https://github.com/emberjs/ember.js/blob/main/packages/%40ember/object/index.ts#L13

this causes rollup to sometimes build it wrong and have runtime errors later. (testing with vite+dep optimizer)