Feature: Allow multiple stream config

[shinnida220]

This PR allows for a single or array of streamConfig. For example

// Single stream config
streamConfig: {
        name: 'mystream',
        subjects: ['order.*'],
},

// multi stream config
 streamConfig: [{
      name: 'mystream',
      subjects: ['order.*'],
  },{
      name: 'myOtherStream',
      subjects: ['other.*'],
}],

Output