Confusing owners v3: Universal link to add an owner

[sche]

Problem statement

This introduces a link that can be shared between owners to add new owner to the safe.

There are two parts in this feature: one is for the new owner to request adding their address - this creates add owner URL to be shared.

The other part is for an existing safe owner to open that URL on mobile device - that would start the special add owner flow.

When the link is opened but the app doesn't have a safe or doesn't have an owner key imported, these situations are handled so that it can be done.

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Requirements

Diagrams

[liliya-soroka]

Verified
app version 3.13.0 (1178)