add support for top level type overrides

[dr-bonez]

Goal

This adds support for easily defining a struct or enum's type definition manually at the top level using the type = ".." attribute. This is useful for when you have a custom serialize/deserialize and don't want to manually implement the TS trait.

Changes

Added type_override to the container attributes, and defined an early-returned implementation for if this attribute is specified

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]

I like this! It's a simple change and it's cleanly implemented!
What do you think @escritorio-gustavo?

[escritorio-gustavo]

I have two small nitpicks, otherwise, LGTM

[escritorio-gustavo]

@NyxCode is there anything else you'd like to change?

[NyxCode]

Nothing from my side!

Great work @dr-bonez, thanks!