Created by: raviagarwal7
Single annotation processors can have multiple processor classes. for eg: AutoValue has these
'com.google.auto.value.processor.AutoAnnotationProcessor',
'com.google.auto.value.processor.AutoValueBuilderProcessor',
'com.google.auto.value.extension.memoized.MemoizedValidator',
'com.google.auto.value.processor.AutoValueProcessor',This now requires creating multiple java_annotation_processor rule.
Adding processor_classes argument so multiple processor classes can be specified in the same java_annotation_processor rule.
propsBuilder already supports adding multiple processor classes.