Prompt the user when the invited MatrixId is not recognized

[giomfo]

Steps to reproduce

Scenario 1:

• Start a new DM by filling a non-existent MatrixId

Scenario 2:

• Open an existing group chat
• Invite a new member by filling a non-existent MatrixId

Outcome

What did you expect?

When the MXID is not recognised (= the getProfile failed (for example: M_NOT_FOUND error, or 502 code) we should present a pop-up similar to the web client:

What happened instead?

Scenario1 : I got an error which prevented me from starting anyway the DM

-> we should replace this error by the following alert:
title: "Confirmation"
message: "Unable to find profiles for this Matrix ID. Would you like to start a DM anyway?"
actions: "Cancel" / "Start DM anyway"

Scenario2: I had to confirm that I wish to invite the new user to a room

-> we should keep this "Confirmation" dialog by updating it when the mxId is unrecognised
title: "Confirmation"
message: "Unable to find profiles for this Matrix ID. Are you sure..."
actions: "Cancel" / "Invite anyway"

Your phone model

No response

Operating system version

No response

Application version

No response

Homeserver

No response

Will you send logs?

No