pick: Implement Fisher-Yates left to right instead of right to left

[webmaster128]

When implementing the algorithm the other way around, the result is in the left positions of the input vector. This allows us to return the result by truncating such which saves a new allocation for the result.

This is how lodash implement's it as well: https://github.com/lodash/lodash/blob/4.17.21/lodash.js#L6767-L6790

However, it's unclear if it is worth the change and should be benchmarked in Wasm. Especially since pick would typically have not too many result items.