The most common scenario is switching between schema versions when
testing. This should alleviate the manual overhead of that for the
majority of cases.
For users, this will show a notification on startup if their database
was purged, similar to what we had with EF.
I can't confirm this works yet, since I'm not sure what the
preconditions are for the `.note` file to be created. What I can confirm
is that a `.note` file hasn't appeared in my game data directory yet.
* `RealmRulesetSetting` was added in 2021.916.0.
* `RealmKeyBinding` was added in 2021.703.0.
Attempting to upgrade from older releases than the above would cause
migrations up to schema versions 10 and 11 to fail.