perf(at): Improve performance and compatibility with lodash

[filipsobol]

It turns out that the native .at() is kinda slow and the behavior when non-integer numbers are used in the indices array is inconsistent with lodash implementation of .at().

import { at as atLodash } from 'lodash-es';
import { at } from 'es-toolkit';

console.log(atLodash([1, 2, 3], [1.5, -1.5, NaN, Infinity, -Infinity])); // [undefined, undefined, undefined, undefined, undefined]
console.log(at([1, 2, 3], [1.5, -1.5, NaN, Infinity, -Infinity])); // [2, 3, 1, undefined, undefined]

This PR improves performance (especially in big arrays) and improve consistency with lodash implementation.

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Performance before:

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Performance after:

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Name	Status	Preview	Comments	Updated (UTC)
es-toolkit	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 6, 2024 10:15am