provide guidance for how users can migrate their code to new authoring layer

[dataders]

things they'd need to change (top of mind):

• column: config: meta:
  • expression
  • alias
• ???

[dbeatty10]

Acceptance criteria for expression and alias

Show a code example in the README (or maybe the manual_fixes folder within dbt-autofix?) that looks like the changes here:

Before:

            alias: email_alias
            expression: split_part(value:email::VARCHAR, '@', 2)

After:

            config:
              meta:
                alias: email_alias
                expression: split_part(value:email::VARCHAR, '@', 2)

[github-actions]

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