Expose primary flag on BeanDefinitionBuilder

Closes gh-23794

spring-beans/src/main/java/org/springframework/beans/factory/support/BeanDefinitionBuilder.java

@@ -314,6 +314,15 @@ public final class BeanDefinitionBuilder {
 		return this;
 	}
 
+	/**
+	 * Set whether this bean is a primary autowire candidate.
+	 * @since 5.1.11
+	 */
+	public BeanDefinitionBuilder setPrimary(boolean primary) {
+		this.beanDefinition.setPrimary(primary);
+		return this;
+	}
+
 	/**
 	 * Set the role of this definition.
 	 */