Support DIFF as a recording mode

[emmyoop]

part of dbt-labs/dbt-common#144

Problem

No support for new Diff mode in recording

Solution

Add DIFF support.

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
• This PR includes type annotations for new and modified functions

[github-actions]

Thank you for your pull request! We could not find a changelog entry for this change. For details on how to document a change, see the contributing guide.

[emmyoop]

Tests will fail until dbt-labs/dbt-common#149 is merged and released

[codecov]

Codecov Report

Attention: Patch coverage is 10.00000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 89.02%. Comparing base (100352d) to head (94cee97).
Report is 7 commits behind head on main.

Files	Patch %	Lines
core/dbt/cli/requires.py	10.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10263      +/-   ##
==========================================
+ Coverage   88.71%   89.02%   +0.31%     
==========================================
  Files         180      180              
  Lines       22483    23108     +625     
==========================================
+ Hits        19946    20573     +627     
+ Misses       2537     2535       -2     

Flag	Coverage Δ
integration	86.42% <10.00%> (+0.45%)	⬆️
unit	62.92% <10.00%> (+1.06%)	⬆️

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