feat: no empty version files

[kptdobe]

Remove empty version files.

This PR includes #188.

[codecov]

Codecov Report

❌ Patch coverage is 91.66667% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/storage/version/put.js	91.66%	2 Missing ⚠️

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[kptdobe]

Moved to draft PR to get time to brainstorm.
As @chrischrischris mentioned, we could use the document metadata to store the info represented by those empty version files: who changed something and when. We never store the "what has changed".

[kptdobe]

If a file is edited a lot, we can have a lot of empty version files - found examples with 250+. And there is no limit.
Another approach could be to have one single history.json file in .da-version/<id>/ that smartly stores the timestamp history (if we want to keep the feature): read history.json, check if last edit was the same user, if yes, replace with current timestamp, if not, add a new entry, write history.json back. But this can be hell in a multi editor context... (high concurrency?)

[auniverseaway]

Seems good to me minus one big question: are "empty version files" different than our audits? I thought audits were basically empty with a few custom metadata properties.

If this is only for true versions, I think this is great. If it's not and this effectively removes audits, we probably need to have a bigger conversation. I'm not opposed to removing audits, but I think we need to discuss as a larger team to decide what replaces them.