Added an attendance page

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Name	Status	Preview	Comments	Updated (UTC)
luttaka	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Mar 7, 2024 2:51pm
open-source-conference-app	❌ Failed (Inspect)			Mar 7, 2024 2:51pm

[suuunly]

I am hopping over on a different project. So someone else is welcome to take over this PR.

What requires testing before it can be set to ready for review is the following:

• verify that the attendance-my-conference.procedure.ts method works as expected.
  • this will require you to make sure that when you buy a ticket, that it is attached to a given conference. (this may additional development from a separate PR)
  • verify that when you select between conferences under the attendances page, that it shows the appropriate attendees

[suuunly]

@Fjandin, would you like to update the ticketing system to connect to specifically created conferences? 😄