Decorator based usage for typia.functional.assertEqualsFunction #1586

Hello, thank you for maintaining and open-sourcing typia. Really love the DX this library offers.

Feature Request

I am using typia.functional module to guard function parameters and return values.

While this works great for standalone functions, it would be great if we could use this (or a similar utility) as decorators on class methods too.

Suggested API:

class UserService {
    @typia.decorators.assertEquals
    async findMany(query: UserQuery) {
        // We only reach here if query is validated to be UserQuery
    }
}

Currently it is possible to do something like this:

class UserService {
    findMany = typia.functional.assertEquals(async (query: UserQuery) => {
        // We only reach here if query is validated to be UserQuery
    })
}

But this doesn't work well if you need other decorators on that method, or need inheritance.