Fix optional fields generic

[gustavo-shigueo]

Goal

Fix missing trait bound for TS::OptionInnerType
Closes #476

Changes

Added TS trait bound to OptionInnerType

Checklist

• I have followed the steps listed in the Contributing guide.
• If necessary, I have added documentation related to the changes made.
• I have added or updated the tests related to the changes made.

[NyxCode]

Nice, I guess that'll do it!
I guess this is TECHNICALLY breaking, right? I doubt it'd break anyone, so idk if we should care..

[gustavo-shigueo]

I guess this is TECHNICALLY breaking, right? I doubt it'd break anyone, so idk if we should care..

Yeah, it's one of those lol, but since we always set OptionInnerType to Self for anything that isn't Option<T> (and advise manual implementations to do the same), it shouldn't matter at all, as Self is, by definition, an implementer of TS