Add a tags field on creation forms

[SamuelHassine]

Problem to Solve

Tags can only be added/removed in the "view" of an entity (threat actor, intrusion sets, etc.).

Current Workaround

None.

Proposed Solution

Add a tags field in the creation forms of entities like the MarkingDefinition.

Additional Information

None.

[maertv]

It seems that following views are missing tag related functionality:

• Tools - details (overview) and update form missing tags.
• Vulnerabilities - details (overview) and update form missing tags.
• Observables - listing, details (overview) and update form missing tags.
• Reports - listing, details (overview) and update form missing tags.

Maybe it is clearer to create separate issues for each case if the view needs to handle tags.

[Fred-certeu]

Hi, I confirm that tagging is crucial for reports
Thanks

[SamuelHassine]

@Fred-certeu I confirm that tagging will be added for Tools/Vulnerabilities/Observables/Reports (#345)