Deprecate Network.id field

The field is deprecated in order to mark the NetworkBuildImpl#id method
deprecated so that the method can later be removed.  We'll undeprecate the
field at that time.

core/src/main/java/org/testcontainers/containers/Network.java

@@ -19,7 +19,7 @@
 
 public interface Network extends AutoCloseable, TestRule {
 
-    Network SHARED = new NetworkImpl(false, null, Collections.emptySet()) {
+    Network SHARED = new NetworkImpl(false, null, Collections.emptySet(), null) {
         @Override
         public void close() {
             // Do not allow users to close SHARED network, only ResourceReaper is allowed to close (destroy) it
@@ -39,16 +39,10 @@ static NetworkImpl.NetworkImplBuilder builder() {
         return NetworkImpl.builder();
     }
 
+    @Builder
     @Getter
     class NetworkImpl extends ExternalResource implements Network {
 
-        @Builder
-        private NetworkImpl(Boolean enableIpv6, String driver, @Singular Set<Consumer<CreateNetworkCmd>> createNetworkCmdModifiers) {
-            this.enableIpv6 = enableIpv6;
-            this.driver = driver;
-            this.createNetworkCmdModifiers = createNetworkCmdModifiers;
-        }
-
         private final String name = UUID.randomUUID().toString();
 
         private Boolean enableIpv6;
@@ -58,6 +52,7 @@ private NetworkImpl(Boolean enableIpv6, String driver, @Singular Set<Consumer<Cr
         @Singular
         private Set<Consumer<CreateNetworkCmd>> createNetworkCmdModifiers;
 
+        @Deprecated
         private String id;
 
         private final AtomicBoolean initialized = new AtomicBoolean();