Tor failed to start for some users because their operating system didn't
ship Tor's dependencies. This change instructs the package manager to
install tor and all its required during the Bisq installation.

Fixes bisq-network#2906

During Bisq's installation the OS's package manager automatically
installs Tor and its required dependecies.

During Bisq's installation the OS's package manager automatically
installs Tor and its required dependecies.

The MigrationService allows us to perform necessary migrations when
upgrading to a new Bisq version. So far, the only option is to try to
perform the migrations on each run. The MigrationService runs the
necessary migrations if the data directory version is below the app
version.

- Test with data directory before MigrationService was introduced
- Test with invalid data directory version
- Test with valid data directory version

This migration writes the current version number to the data directory.
The remaining migrations depend on another open PR and will follow soon.