There was an issue where imported messages from third-party services
would cause super laggy scroll behaviour in the chat view.
The reason for that is that on scroll, the app keeps calling
`getVerificationRequestFrom()` on the chatkey of the community.
Typically the results of these requests are cached so that it should
perform the call only once, but because there's no actual verification
request/contact for the community chat key (all third-party messages are
signed by the community), the call keeps on happening over and over.
This commit adds a flag to `getContactDetailsAsJson` and `isEnsVerified`
to control whether or not the call to `getVerificationRequestFrom`
should in fact be made (which should not be the case for imported
messages).
The result of this is a smoother scrolling experience.
Fixes#7767
d9acab566f