Enhance IfElseIfConstructToSwitch to support "return" statements

[Jenson3210]

Currently the IfElseIfConstructToSwitch recipe does not convert to a switch if any of the parts would return.
However, if all branches would return, we could convert it to and it could be a potential candidate. Only the intermediate phase of having returns in the case is not valid, hence would not be picked up by:

• Convert assigning Switch statements to Switch expressions #718

    static String formatter(Object obj) {
        if (obj instanceof String s) {
            return s;
        } else if (obj instanceof Long l) {
            return String.valueOf(l);
        } else {
            throw new IllegalStateException("Unexpected value: " + obj);
        }
    }

could become

    static String formatter(Object obj) {
        return switch (obj) {
            case String s -> s;
            case Long l -> String.valueOf(l);
            default -> throw new IllegalStateException("Unexpected value: " + obj);
        };
    }

[timtebeek]

Adding a quick note here that following the Unwrap else after return recipe this case might not happen too often on our own code:

• Unwrap else after return in preceding if rewrite-static-analysis#645