Disappearing Messages similar to the Signal messaging app.

[gitr0n1n]

Is your feature request related to a problem? Please describe.
Disappearing Messages similar to the Signal messaging app. It is a pain to manually delete messages. An auto purge method after x days/weeks would be great for server resources and privacy.

Describe the solution you'd like
Implement Disappearing Messages similar to the Signal messaging app.

Describe alternatives you've considered
None, this is straight forward and should be a default feature.

Additional context
review a great implementation of this feature in this app: https://www.signal.org/

Related Issues:
matrix-org/synapse#6287
element-hq/element-meta#729
#16187
element-hq/element-ios#3948
element-hq/element-android#2691

Dated Issue:
https://github.com/vector-im/element-web/issues/2497

[t3chguy]

Duplicate of element-hq/element-meta#82

[t3chguy]

We don't create duplicate issues just because one is older and has a lot more feedback.