End to end encryption for federation

[individual-it]

Is your feature request related to a problem? Please describe.
We can already federate with Matrix servers, but it's impossible to read or write encrypted messages.
A lot of channels/groups in the matrix world are encrypted, users from Rocket.Chat can be invited to those groups, but cannot see any content that was sent encrypted.

Describe the solution you'd like
Rocket.Chat already can handle E2EE, it would be great if that same system can be used for

Describe alternatives you've considered
Some extra setting to setup E2EE for matrix