[Feature]: Vue typesafe mount slots and events

[sand4rt]

🚀 Feature Request

vue-component-type-helpers is already used for the mount props, but it would be nice to extend its use to slots and events as well:

• slots: https://github.com/vuejs/language-tools/blob/5c65f102d01ade46975001e8509f26a2d90774e9/packages/component-type-helpers/index.ts#L11-L14
• events: https://github.com/vuejs/language-tools/blob/5c65f102d01ade46975001e8509f26a2d90774e9/packages/component-type-helpers/index.ts#L16-L18

Example

• mount(Component, { slots: { does_not_exist: 'does_not_ exist' } } <-- throws an type error
• mount(Component, { on: { does_not_exist: () => {} } } <-- throws an type error

Motivation

Type errors directly into my editor without having to run the tests to see where the problem is