Added functionality for modifing graph metadata using UI

[jddanna]

Updated old PR #364

Fixes #317

Implemented UI for modifying user meta-data which includes the following

• User will be able to modify graph attributes by clicking on the "edit" button.
• User will be able to modify description in "Graph Information" tab.
• User will be able to modify tags, title, name in the edit panel which appears on clicking "edit" button.
• Corresponding changes will also be reflected in the database.

Gif of the implementation

Introduced Problem from original PR:

When all the tags are removed and an update is performed, Elastic search was not updating properly. The map_attributes method wasn't returning the proper name for tags. It was returning tags without a data type because tags was an empty dictionary. In order for elasticSearch to update the tags, it must be in the format of string_tags, so we added a case in map_attributes to append the data type to tags:

if (key == 'tags'): value_type = DataType.forValue("String")

Thanks to @bruce-wayne99 for original PR fix

[jddanna]

Adding a dropdown to "Edit" button would help to notify users what content can be updated with the button (metadata).