[FR] add actions hooks

[ComfortablyCoding]

This FR is a solution to the issue discussed in #23 and will add hooks for all actions to enable a user to execture any desired code when those actions are executed.

Sample impl is mentioned in #2901963 - comment

module.exports = ({ env }) => ({ 	
  publisher: {
    enabled: true, 	
    config:{
      hooks:{
        'publish:after': (entity, mode) => {
              
         },
         'unpublish:after': (entity, mode) => {
             
         }
      }
    }
  }
});