Add checksums to versions

[hgeraldino]

Adding this issue to track the work required on the db-migrations module to support sdkman/sdkman-cli#945

[marc0der]

Happy that this is finally happening!

I'd suggest we chat on Slack prior to kicking of individual pieces of work. That way I can guide you in the optimal way of doing things in the backend, which should hopefully save you some time in implementing this. You've also probably noticed that we're big on testing, so we expect most pieces of functionality to be covered somehow.