removing playbook and merging it into Engine directly

[heckj]

Description

• remove explicit playbook structure and results for playbook

Motivation and Context

resolves #59
resolves #57

How has this been tested?

Maintain all existing tests, and merged playbook execution tests back into engine

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected. Examples include renaming parameters in public API, removing public API, or adding a new parameter to public API without a default value.)

Checklist

• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• I have run ./scripts/preflight.bash and it passed without errors.

[codecov]

Codecov Report

Attention: Patch coverage is 94.11765% with 1 line in your changes missing coverage. Please review.

Project coverage is 65.98%. Comparing base (de1cbf6) to head (c4e9782).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
Sources/Formic/Engine/CommandExecutionResult.swift	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #60      +/-   ##
==========================================
- Coverage   66.78%   65.98%   -0.81%     
==========================================
  Files          24       23       -1     
  Lines        1168     1117      -51     
==========================================
- Hits          780      737      -43     
+ Misses        388      380       -8     

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