feat: implement unwrap_or in the OptionTrait

[Eikix]

Feature Request

Describe the Feature Request

Hey all!
Following this conversation on Kakarot, kkrt-labs/kakarot-ssj#322 (comment)
We wanted to see if it's possible to incorporate a unwrap_or method in the OptionTrait.

Describe Preferred Solution

Add one function in the OptionTrait:
unwrap_or

pseudo code:

fn unwrap_or(self: Option<T>, default: T) -> T {
    match self {
        Option::Some(x) => x,
        Option::None => default,
    } 
}

Additionally, I can implement unwrap_or_default

fn unwrap_or_default<+Default<T>>(self: Option<T>) -> T {
    match self {
        Option::Some(x) => x,
        Option::None => Default::default(),
    } 
}

Additional Context

If the feature request is approved, would you be willing to submit a PR?
(Help can be provided if you need assistance submitting a PR)

• Yes
• No

[orizi]

feel free to open a PR - sounds good.

[Eikix]

Okay opening a PR soon (tm)