feat: update `Collection::fromFile` constructor

[drupol]

I saw a presentation made by a French company: https://speakerdeck.com/goathier/collection

In their slides, I had the feeling that parsing a CSV file was too complicated, so I had the idea to implement the feature in loophp/collection. But to do that, I had to update loophp/iterators first, see the relevant commit.

This PR:

• [x] Update Collection::fromFile constructor in a non-breaking backward compatibility
• [x] It breaks backward compatibility (Minor BC - the signature of Collection::fromFile() has been updated, the length parameter has been replaced with the consumer parameter.)
• [x] Is covered by unit tests
• [x] Has static analysis tests (psalm, phpstan)
• [x] Has documentation
• [ ] Is an experimental thing

[alexandre-daubois]

Gauthier told me you created this PR, that's a big yes to me! This will definitely improve the DX when dealing with files. We'll definitely use this feature in production as soon as it is available 🚀