feat: control if an application is allowed to contribute activities

[danielwiehl]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit follows our guidelines
• Tests for the changes have been added (required for routing or view grid related issues)
• Public API has been documented

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] Documentation content changes
[ ] Other... Please describe:

Issue

Issue Number: #122

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information