Detect duplicate cases in switch

[Luro02]

What it does

Implementation should be like #407 and #363.

Lint Name

DUPLICATE_SWITCH_CASE

Category

structure

Example

switch (value) {
    case "a" -> {
        System.out.println("hello");
        System.out.println("hello");
    }
    case "b" -> {
        System.out.println("hello b");
    }
    case "c" -> {
        System.out.println("hello");
        System.out.println("hello");
    }
    default -> {}
}

Could be written as:

switch (value) {
    case "a", "c" -> {
        System.out.println("hello");
        System.out.println("hello");
    }
    case "b" -> {
        System.out.println("hello b");
    }
    default -> {}
}