Tagpack-tool: Introduce possibilities of automatic schema updates for non breaking changes.

[soad003]

Updates of the tagpack tool often require to set up an entirely new instance esp. if schema changes where made.

This is a time consuming process and needs some thought to avoid downtime in production.

It would be nice to add some schema versioning and migration capabilities to the tagpack tool. (e.g. via or similar projects https://pypi.org/project/yoyo-migrations/)

This would simplify the maintainance of our tagpack instance.