This PR adds reactions for tasks and comments, similar to what you can do on Gitea, GitHub, Slack and plenty of other tools.
Reviewed-on: https://kolaente.dev/vikunja/vikunja/pulls/2196
Co-authored-by: kolaente <k@knt.li>
Co-committed-by: kolaente <k@knt.li>
Previously, when creating a filter query with the 'in' operator and multiple values, autocompletion and highlighting was not available. This change now implements a split for each value, seperated by a comma.
Before this change, applying a filter and then scrolling a bucket would not use that filter when lazy loading the tasks in that bucket. That resulted in all tasks being loaded, regardless if the filter applied to them.
