Enable Serializable annotation to be given to Type Parameter as well

[TBSten]

What is your use-case and why do you need this feature?

Some functions, such as Navigation Compose's TypeSafe DSL, require the Type Parameter they accept to be Serializable. Currently this can only be a run-time error.

Describe the solution you'd like

These should be checked at compile-time to improve the development experience.

// ⭐️ Should allow @Serializable to be given to Type Parameter T
fun <@Serializable T> someFun() { TODO() }

@Serializable
class MySerializable

class MyNotSerializable

fun test() {
    someFun<String>() // 🟢 OK
    someFun<String>() // 🟢 OK
    someFun<MySerializable>() // 🔴 NG(Compile error): someFun.T must be @Serializable
}