Add Check Support for Java 21 Pattern Matching for Switch Syntax: NoWhitespaceBeforeCaseDefaultColon

[mahfouz72]

child of #14961

I have read check documentation:https://checkstyle.org/checks/whitespace/nowhitespacebeforecasedefaultcolon.html
I have downloaded the latest checkstyle from: https://checkstyle.org/cmdline.html#Download_and_Run
I have executed the cli and showed it below, as cli describes the problem better than 1,000 words

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PS D:\CS\test> cat src/Test.java                                                
record ColoredPoint(int p, int x, boolean c) { }
record Rectangle(ColoredPoint upperLeft, ColoredPoint lowerRight) { }

public class Test {
    void test(Object obj) {   // NPath = 6
        switch (obj) {
            case ColoredPoint(int a, int b, _) when (a >= b) : {} break; // violation
            case ColoredPoint(int a, int b, _) when (b > 100) : {} break; // violation
            case ColoredPoint(int a, int b, _) when (b != 1000) : {} break; // violation
            case ColoredPoint(int a, int b, _) when (b != 100000) : {} break; // violation
            case Rectangle(_,_) : {} // violation
            default : System.out.println("none"); // violation
        };
    }
}
PS D:\CS\test> cat config.xml                                                   
<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
        "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
        "http://www.puppycrawl.com/dtds/configuration_1_3.dtd">
<module name="Checker">
    <property name="charset" value="UTF-8"/>
    <module name="TreeWalker">
        <module name="NoWhitespaceBeforeCaseDefaultColon">
        </module>
    </module>
</module>
PS D:\CS\test> java  -jar checkstyle-10.17.0-all.jar -c config.xml src/Test.java
Starting audit...
[ERROR] D:\CS\test\src\Test.java:7:62: ':' is preceded with whitespace. [NoWhitespaceBeforeCaseDefaultColon]
[ERROR] D:\CS\test\src\Test.java:8:63: ':' is preceded with whitespace. [NoWhitespaceBeforeCaseDefaultColon]
[ERROR] D:\CS\test\src\Test.java:9:65: ':' is preceded with whitespace. [NoWhitespaceBeforeCaseDefaultColon]
[ERROR] D:\CS\test\src\Test.java:10:67: ':' is preceded with whitespace. [NoWhitespaceBeforeCaseDefaultColon]
[ERROR] D:\CS\test\src\Test.java:11:33: ':' is preceded with whitespace. [NoWhitespaceBeforeCaseDefaultColon]
[ERROR] D:\CS\test\src\Test.java:12:21: ':' is preceded with whitespace. [NoWhitespaceBeforeCaseDefaultColon]
Audit done.
Checkstyle ends with 6 errors.
PS D:\CS\test> 

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This check is working as expected.

[nrmancuso]

Let's create a new test case in this check, it doesn't have to be super involved.