[FEATURE] Specify maximum annotations per user

[lgienapp]

Is your feature request related to a problem? Please describe.

When using argilla for crowdsourced annotation workflows on large datasets, it would be necessary to enforce per-user limits on how many annotations can be submitted.

Describe the solution you'd like

I would like a way to enforce an upper limit on how many instances each user can annotate. This could be added as part of a DistributionStrategy, featuring a max_annotations_per_user parameter.

As a bonus, if an upper limit is set, the progress tracker could then reflect the personal progress of the user instead of the dataset progress.

Describe alternatives you've considered

A workaround is sharding the dataset into slices of max annotations size and selectively adding users to each; this creates huge overhead.
A different approach is having secondary app running that monitors user stats and removes them from the workspace if their upper limit is reached. Again, overhead.