function-resource refinements

[NullVoxPopuli]

feat(function-resource): support encapsulated tracked state

This is based on ideas from https://wycats.github.io/polaris-sketchwork/reactivity.html
Where a function-based resource may return an arrow function instead
of a non-function-value. This allows the function-based resource to
conusme and update its own tracked state without invalidating itself.

Previously, in order for function-based resources to have their own
tracked state, an object had to be returned, and it was up to the
consumer to consume that tracked state via property access.

With this arrow-function return, we can provide a single reactive value
via the resource as well as encapsulated state.

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Estimated impact to a consuming app, depending on which bundle is imported

	js	min	min + gzip	min + brotli
/index.js	24.39 KiB	5.17 KiB	1.3 KiB	1.08 KiB
/core/index.js	4.21 KiB	1.89 KiB	898 B	763 B
/util/debounce.js	2.67 KiB	797 B	415 B	348 B
/util/ember-concurrency.js	5.39 KiB	1.6 KiB	748 B	635 B
/util/function-resource.js	11.69 KiB	3.06 KiB	1.16 KiB	974 B
/util/function.js	4.09 KiB	1.83 KiB	720 B	615 B
/util/helper.js	1.8 KiB	303 B	218 B	177 B
/util/map.js	5.83 KiB	2.48 KiB	1.02 KiB	878 B
/util/remote-data.js	5.01 KiB	1.83 KiB	705 B	618 B

[github-actions]

🎉 This PR is included in version 4.10.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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