Tag system for administrators/evaluators

Is your feature request related to a problem? Please describe.
The current category mechanism in Decidim is insufficient for evaluators and administrators. The current version of categories is both visible and configurable by end-users, which is good for the general use case but can't be used for evaluation and analysis of proposals. Administrators who require their own set of labels for effective management and analysis.

Describe the solution you'd like
The proposed solution is to implement a restricted-access tagging system exclusively for evaluators and administrators. This would enable the creation, editing, and assignment of multiple tags to individual contributions. Additionally, the feature should include an option to export data that carries these tags.

Features:

1. Tag Creation: Evaluators and administrators can initialize and modify tags via a dedicated back-office interface.
2. Tag Allocation: The system should allow each contribution to be marked with one or more tags.
3. Data Export: Implement functionality to export a CSV or Excel file that contains all tagged contributions.

Additional context

Does this issue could impact on users private data?

Funded by
OSP and it's clients