Ability to Tag Charts for Easy Filtering

[shanmukhsista]

As a user, i would like to tag charts in superset and have the ability to filter based on some custom tags. I would imaging some grouping of charts and then focus on certain groups for multiple projects.

Describe alternatives you've considered
As an alternative, right now i just sort the Charts in descending order of timestamp. / creation date.

I would like to work on this change if such a feature is accepted and propose the following changes :

1. Charts will have a tags attribute
2. API should be able to filter charts based on tags.

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