Enforce leading/trailing zeros in Java numeric constants (#2105)

Enforce that integer literals must not have leading zeros and that floating point literals must have leading or trailing zeros in Java.

wpilibj/src/test/java/edu/wpi/first/wpilibj/controller/PIDInputOutputTest.java

@@ -43,7 +43,7 @@ class PIDInputOutputTest {
     double out = 0;
 
     for (int i = 0; i < 5; i++) {
-      out = m_controller.calculate(.025, 0);
+      out = m_controller.calculate(0.025, 0);
     }
 
     assertEquals(-0.5 * m_controller.getPeriod(), out, 1e-5);