feat(request): Add request options

[ElPicador]

No description provided.

[clement-leprovost]

Honestly, I don't speak Scala, so there is no way that I can review that meaningfully. :/

[aseure]

LGTM 👍

I only have two questions though:

1. Should we standardize the naming of the extra/custom headers/URL parameters (some PRs use extra whereas others use custom)

2. What does type T = ... do at the beginning of every case class ...Definition?

[ElPicador]

The T is the type of return of the methods.
This way you parametrize a class with itself, so every overloaded method returns it's own type

[ElPicador]

for the extra/custom, I have no opinion. Maybe @clement-leprovost has one?

[clement-leprovost]

I like "extra" better, because everything in the request options is already "custom". :)