fix: Include borrowed types' type arguments in typescript

[aatukaj]

Borrowed types' type arguments weren't previously being included in the typescript export.
e.g.

struct A<'a> {
    b: &'a Vec<usize>,
}

Would be exported as:

interface A { b: Array, }

With this pr it's exported correctly as:

interface A { b: Array<number>, }

[NyxCode]

Thanks for the PR!