[build] Apply spotless for java formatting (#1768)

Update checkstyle config to be compatible with spotless.

Co-authored-by: Austin Shalit <austinshalit@gmail.com>

wpimath/src/test/java/edu/wpi/first/math/WPIMathJNITest.java

@@ -4,10 +4,10 @@
 
 package edu.wpi.first.math;
 
-import org.junit.jupiter.api.Test;
-
 import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
 
+import org.junit.jupiter.api.Test;
+
 public class WPIMathJNITest {
   @Test
   public void testLink() {