Export and import SMS

[DWolf-19]

Describe your suggested feature

Add feature for exporting all SMS messages to a file and importing them to the app.

Other details

It's already implemented in the Fossify Messages. Old correspondence may remain in SMS messages, as well as some sort of banking transaction log. It would be useful to have a feature of transferring messages when changing device.

Acknowledgements

• [X] I have searched the existing issues and this is a new ticket, NOT a duplicate or related to another open issue.
• [X] I have written a short but informative title.
• [X] I will fill out all of the requested information in this form.

[Bnyro]

Connect You doesn't support MMS, and I fail to see a reason to implement this for SMS.

Please properly update the issue template with more information.

[DWolf-19]

Edited, btw.