#1221 UI for message passwords

[sosnovsky]

This PR adds UI for setting message passwords

close #1221

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Tests (delete all except exactly one):

• Tests added or updated - updated SendEmailToRecipientWithoutPublicKey test with new password functionality

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To be filled by reviewers

I have reviewed that this PR... (tick whichever items you personally focused on during this review):

• addresses the issue it closes (if any)
• code is readable and understandable
• is accompanied with tests, or tests are not needed
• is free of vulnerabilities
• is documented clearly and usefully, or doesn't need documentation

[sosnovsky]

@tomholub password UI is ready, but I think we should merge it into the master only after finishing other tasks from #955, as currently it's only UI without functionality.

[tomholub]

@tomholub password UI is ready, but I think we should merge it into the master only after finishing other tasks from #955, as currently it's only UI without functionality.

We can merge it, this will take care of it:

let domainsWithPasswordSupport = ["flowcrypt.com"]

There are no customers on flowcrypt.com domain 😃 so we can safely merge it without affecting anyone.

// edit - I just saw that the code decides on domain of the recipient, but we should be deciding based on domain of sender. So that the functionality is only available to our team until finalized. It will take more than one PR, and I'd rather merge them gradually instead of waiting.

[tomholub]

Didn't run app yet - please see code comments.

[tomholub]

Please make sure to also resolve the hidden conversations (github hides them by default when too many)

[tomholub]

Almost perfect, except:

• setting empty string on this modal should not be allowed. I could use cancel for that. So either I enter an actual string, or it should tell me to enter one. Soon there will also be more complex evaluation of password strength, so some way to indicate the input is invalid is needed anyway.

• crash when trying to remove recipient

[sosnovsky]

• crash when trying to remove recipient

@tomholub are you able to reproduce it with the latest code? As recipients deletion works well for me - no crash occurred

[tomholub]

Changes look good. Will retry the deletion

[tomholub]

Still reproduce, it's actually when tapping the recipient. This is on simulator.

1. start typing email of someone who doesn't have pubkey in recipient field. Choose suggestion from offered contacts.
2. now the contact is gray and it prompts me to add password
3. I tap the gray recipient bubble
4. crash:

[tomholub]

This fixed the issue 👍