Auto rename and coerce columns on ingest

[sergiimk]

Description

Closes: #790

If user does not declare read schema or preprocess step (which is always the case when ingesting data from a file upload) we apply the following new inference rules:

• if event_time column is present - we will try to coerce it into a timestamp
  • strings will be parsed as RFC3339 date-times
  • integers will be treated as UNIX timestamps in seconds
• if any of the columns conflicts with system column - it will get renamed with an underscore prefix

While I like being strict about names and types, I think this should improve the overall user experience.

Checklist before requesting a review

• [x] Unit and integration tests added
• [x] Compatibility:
  • [x] Network APIs: ✅
  • [x] Workspace layout and metadata: ✅
  • [x] Configuration: ✅
  • [x] Container images: ✅
• [x] Documentation:
  • [ ] Changelog: ✅
  • [x] Public documentation: ❌ will add a paragraph to public docs if this gets merged
• [x] Downstream effects:
  • [x] kamu-node: ✅

[zaychenko-sergei]

Changelog missing