add confirm changes action via change sets

[samuelstroschein]

Context

To increase the WOW effect of the demo, the CSV app needs to have a confirm changes feature.

Proposal

Implement confirm changes quickly via change.meta to

• avoid implementing generalizedLIXDK-158 before demo
• gain insights for LIXDK-158

[samuelstroschein]

@martin.lysk1 yep you're right. the change.metadata field makes sense because APPS can add metadata to changes. I can implement change sets and tags via the metadata field without requiring lix to implement them 🤯 That entails though:

• plugins DON'T report metadata (as they do right now), only snapshots
• we should likely implement Metadata as own table due to the same insight as LIXDK-166 && being able to track metadata changes itself (similar to LIXDK-153)