Please add Nextcloud tables to the user_migration export

[Markoise]

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Feature request

Which Nextcloud Version are you currently using: (see administration page)
Nextcloud 30.0.0

Is your feature request related to a problem? Please describe.
No

Describe the solution you'd like
It would be nice if you could also export the tables and data from Nextcloud Tables to restore them when moving.

Describe alternatives you've considered

Additional context

[come-nc]

(Transfered from user_migration repo, as this should be done in this application by implementing a migrator, like what is done for dav for instance: https://github.com/nextcloud/server/tree/master/apps/dav/lib/UserMigration )