Reduce visibility of hint factory methods

Reduce the visibility of hint factory methods that return a `Builder`.
Since the `build()` method of the `Builder` is package-private the
factory methods can also be package-private.

spring-core/src/main/java/org/springframework/aot/hint/ExecutableHint.java

@@ -48,7 +48,7 @@ public final class ExecutableHint extends MemberHint {
 	 * @param parameterTypes the parameter types of the constructor
 	 * @return a builder
 	 */
-	public static Builder ofConstructor(List<TypeReference> parameterTypes) {
+	static Builder ofConstructor(List<TypeReference> parameterTypes) {
 		return new Builder("<init>", parameterTypes);
 	}
 
@@ -58,7 +58,7 @@ public final class ExecutableHint extends MemberHint {
 	 * @param parameterTypes the parameter types of the method
 	 * @return a builder
 	 */
-	public static Builder ofMethod(String name, List<TypeReference> parameterTypes) {
+	static Builder ofMethod(String name, List<TypeReference> parameterTypes) {
 		return new Builder(name, parameterTypes);
 	}
 

spring-core/src/main/java/org/springframework/aot/hint/TypeHint.java

@@ -68,7 +68,7 @@ public final class TypeHint implements ConditionalHint {
 	 * @param type the type to use
 	 * @return a builder
 	 */
-	public static Builder of(TypeReference type) {
+	static Builder of(TypeReference type) {
 		Assert.notNull(type, "'type' must not be null");
 		return new Builder(type);
 	}
@@ -145,7 +145,7 @@ public final class TypeHint implements ConditionalHint {
 		private final Set<MemberCategory> memberCategories = new HashSet<>();
 
 
-		public Builder(TypeReference type) {
+		Builder(TypeReference type) {
 			this.type = type;
 		}