ES Mapping - Custom Entry Mapping Item

Context :

We need to be able to add a feature independently of a PP 

Designs :

https://www.figma.com/file/TKic9bHB2tuCkW4aveonak/NOS---Design?node-id=236%3A25090

To Do :

• Create button on Elasticsearch Mapping page to get to it  
• Link to a pop-up with Select Field as you have 'Edit Binding' in PP 
• Lands on the previously defined feature page 

AC :

• As a user, I can select a button on my mapping page to a creation pop-up with 'Edit binding' like function, non-useable fields are filtered out 

• I save my feature as normal (top right hand, no disable) and it will appear in the Elasticseach Mapping list
• If the JSON editor detects an error, it will highlight that error with an 'Editor Error' label in the Elastic mapping page