fix(cell): improve typings of the cell utility

[NullVoxPopuli]

in typescript / glint, cell will now infer the type.
when you use cell with no initial value, you'll want to explicitly declare the type, as is demonstrated in the it works cell rendering test

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[github-actions]

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

	js	min	min + gzip	min + brotli
/index.js	12.54 kB	3.15 kB	1.28 kB	1.13 kB
├── core/class-based/index.js	4.1 kB	1.8 kB	883 B	761 B
├── core/function-based/index.js	5.71 kB	552 B	269 B	213 B
└── core/use.js	1.73 kB	415 B	256 B	203 B
/util/cell.js	1.99 kB	800 B	410 B	346 B
/util/debounce.js	2.64 kB	771 B	408 B	340 B
/util/ember-concurrency.js	4.35 kB	1.53 kB	733 B	624 B
/util/function-resource.js	216 B	154 B	123 B	87 B
/util/function.js	4.03 kB	1.78 kB	703 B	595 B
/util/helper.js	1.8 kB	303 B	218 B	177 B
/util/keep-latest.js	1.75 kB	519 B	292 B	236 B
/util/map.js	5.66 kB	2.38 kB	993 B	847 B
/util/remote-data.js	4.86 kB	1.75 kB	674 B	593 B

[github-actions]

🎉 This PR is included in version 5.2.2 🎉

The release is available on:

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

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