Warn user if imported key has derivation path different from xpub's depth

[roshii]

Fixes #397

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[k9ert]

@stepansnigirev maybe you can have a look whether that PR goes in the right direction.

[roshii]

for the record: I marked it as draft since I want to ensure users are properly notified - so far it is only printing a line to the logs

[stepansnigirev]

Makes sense. We should notify about these inconsistencies at least in the logs. Warnings in the UI would be even better.

[roshii]

I did try to have this notification sent top UI but my frontend knowledge is pretty limited. Since I will not have enough time to investigate UI modification, I will leave it as is, with a simple warning in the logs.
Hope this helps.