feat: custom events

[hamed-musallam]

we implemented event manager as a sample to use the custom event to trigger load spectra event, it contains three function

trigger (event, data) 
on (event, listener)
clean (event, listener)

To test loading spectra from external URL
1- import events from ' path /events'
2- call trigger("load",data:NMRiumData)

 events.trigger('load',  {
 spectra: [
   {
     source: {
       jcampURL:
         'https://cheminfo.github.io/nmr-dataset-demo/cytisine/13c.jdx',
     },
   },
 ],
});

We could have two main custom events
1- nmr-wrapper:load
which takes the exact data structure of the data prop of NMRium component
2- nmr-wrapper:dataChange
which returns the whole NMRium state, unless we decide they the data has to be manipulated in a specific way before triggering the event, in this case, we could return the data in this structure {type:"addPeak",data:{}}