Adap 321/support all on schema change options

[VersusFacit]

related to fully supporting #321

Problem

alter statements in incremental strategies need the table format.

Solution

Thankfully, we were well set up to leverage our existing relation abstractions to make these work out of box.

scenarios hand-tested:

• sync_all_columns:
  • add column
  • remove a column
  • add and remove a column
• append_new_columns:
  • add columns
  • don't delete columns that no longer are in DDL

✅ These changes only apply to incremental-run affected columns

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX