add shipping faker for logistics and tracking data (#26)

Implement comprehensive Shipping faker module to generate realistic shipping and logistics test data including:
- Tracking numbers for major carriers (UPS, FedEx, USPS, DHL)
- Shipping methods, statuses, and package types
- Package dimensions, weights, and costs
- Delivery dates and time windows
- Facility locations and tracking events
- Handling instructions and exception types

Includes 32 test cases with full coverage of all methods.

Author: TheJavaGuy

src/main/java/org/thejavaguy/javafaker/Faker.java

@@ -108,6 +108,7 @@ public class Faker {
     private final Sip sip;
     private final EnglandFootBall englandfootball;
     private final Mountain mountain;
+    private final Shipping shipping;
 
     public Faker() {
         this(Locale.ENGLISH);
@@ -225,6 +226,7 @@ public Faker(FakeValuesService fakeValuesService, RandomService random) {
         this.sip = new Sip(this);
         this.englandfootball = new EnglandFootBall(this);
         this.mountain = new Mountain(this);
+        this.shipping = new Shipping(this);
     }
 
     /**
@@ -702,6 +704,15 @@ public StarCraft starCraft() {
 
     public Mountain mountain() { return mountain; }
 
+    /**
+     * Returns a Shipping instance for generating shipping-related fake data.
+     *
+     * @return a {@link Shipping} instance
+     */
+    public Shipping shipping() {
+        return shipping;
+    }
+
     public String resolve(String key) {
         return this.fakeValuesService.resolve(key, this, this);
     }