[WIP] Microbatch parallelism

[MichelleArk]

Resolves #

Problem

Solution

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 or 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.

TODO:

• consider adapter opt-in
• model-level configuration for parallel vs serial execution mode
• get dbt build working with MicrobatchModelRunner
• keyboard interrupts
• merge from main
• node_info

[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 96.94656% with 4 lines in your changes missing coverage. Please review.

Project coverage is 86.36%. Comparing base (289d2dd) to head (801aede).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10958      +/-   ##
==========================================
- Coverage   89.13%   86.36%   -2.77%     
==========================================
  Files         183      183              
  Lines       23552    23644      +92     
==========================================
- Hits        20993    20421     -572     
- Misses       2559     3223     +664     

Flag	Coverage Δ
integration	86.36% <96.94%> (-0.13%)	⬇️
unit	?

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Components	Coverage Δ
Unit Tests	86.36% <96.94%> (-2.77%)	⬇️
Integration Tests	86.36% <96.94%> (-0.13%)	⬇️