feat(collections): add minBy

[majidsajadi]

Implemented the minBy method in the collection module. ref: #1065

Types are declare based on this comment

Let me know if I should add any specific test cases.

[LionC]

All comments from my maxBy review apply here as well

[majidsajadi]

@LionC changes from maxBy applied here too.

[LionC]

Hey @majidsajadi . I am really sorry that I missed that before, but I think we should be consistent with the types we allow for orderings according to sortBy. Do you think you could add those?

I think the best way to do that is actually an overload instead of a giant generic thing (which I will change in sortBy myself). It should not be too hard to do, but hmu on Discord if you need help.

The same goes for the other max/min-By/Of PRs :-S

[kt3k]

@majidsajadi Thank you for your contribution! LGTM

@LionC Let's address typing issue in later PRs.