Ability to copy fields in the metadata schema editor

[#1]

Request for Feature Enhancement (RFE) Summary:	Ability to copy fields in the metadata schema editor
Use-case:	When creating a metadata schema that involves similar fields, it will be a lot easier if there was a copy function for the fields
Current/Experienced Behavior:	No copy function for metadata fields. We need to define similar rule settings over and over again for several metadata fields
Improved/Expected Behavior:	Ability to copy fields so that rule settings, field type, and field options (if applicable) will be copied as well.
Environment Details (AEM version/service pack, any other specifics if applicable):
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