Feature Request: Multi-account support

[tandy-1000]

Is your feature request related to a problem? Please describe.

Hydrogen is the only other web client which offer multi-account support, it would be nice to have a more modern client with this feature.

Describe the solution you'd like

Hydrogen does it like this:

[viasux]

Would love this! <3 - Also if it could be multi account across other homeservers as well!~

[redthing1]

This would be awesome.

[kfiven]

We have some underlying support done for multiple accounts but this is on hold until we figure out how multiple accounts are going to work with OIDC as overall account management is no longer a client's job.