Show/filter participants in overview (+ maybe more filter options)

[watuLammini]

Checklist

• I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
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• This issue contains only one feature request.
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Feature description

It would be great to have an option for filtering events by participation status. Especially when using a shared calendar it can get quite full and cluttered. Google calendar for example shows all events, where you are part of (defined as ATTENDEE or ORGANIZER in iCalendar), as color-filled boxes and all others as outlined boxes.
This could maybe be integrated with possible other filtering features, as described in #478 or #162 (so you could for example only show events of the category “concert” or events where your best friend is part of). But this would get more complex.

Why do you want this feature?

This would make it super easy to spot events, like meetings, where you are a part of. Otherwise, you have to manually scan through them and add them to your own calendar, leaving you with duplicates.

Additional information

No response