[Editor-source-view] Validations required for attribute/payload mapping for sink/source annotation

[Pradeepa Jeyaraj]

Description:
In the source-view when attribute or payload is mapped for the sink/source annotations, it lacks validations.
Required Validations -

1. When an extra attribute is mapped as key/value pairs (attribute or payload mapping), there is no error displayed [source and sink]
   

2. When the stream attributes are not mapped as key/value pairs (attribute or payload mapping), there is no error displayed [sink]
   

3. When the attributes are mapped as list (attribute mapping), there is no error displayed when the length of the mapped attributes differs from the length of the stream attributes [sink]