Show currently active other users and react to connection status #70
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Description
Show the currently editing other users as little icons in the top right corner:
when the editor is disconnected from da-collab, disable the editing area until a reconnect happens:
![disconnect](https://private-user-images.githubusercontent.com/226514/308594735-2800ffa8-9a0b-4fec-ac84-e77d8eafd749.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3Mzk1ODEwODQsIm5iZiI6MTczOTU4MDc4NCwicGF0aCI6Ii8yMjY1MTQvMzA4NTk0NzM1LTI4MDBmZmE4LTlhMGItNGZlYy1hYzg0LWU3N2Q4ZWFmZDc0OS5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjUwMjE1JTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI1MDIxNVQwMDUzMDRaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT0xMTgwN2Q4ZjU2MTc4YWQ2YzU3MDljMjYxMmQ1MDdkZDg5YjVjN2JjYmQ0MjRjYTcxMTBkNGIwMGVkZDJlNTMwJlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCJ9.RF6az-d4jjDm-0fOrXtnRMM_RBlaOin1j9JTVi95FpQ)
Motivation and Context
To make the editing more robust in case of a disconnection with da-collab and also to provide awareness of other users active in the document.
Types of changes
Checklist: