feat: native `for` loop

[aitchFactor]

Implement compiling this block:

Maybe with procedurally generated index variable (similar to function call variables). This would improve the programming experience and would save unnecessary blocks in ambitious projects.

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Possible additional features:

1. Custom index range - compile every use of the index variable to map to the index range.

Or procedurally generate another index variable that maps to the range.

2. Pythonic list iteration

[faretek1]

I think this should simply be an optimisation (low priority). You can do the functionality without it anyway