Add <reason> arg to do_nothing command

[fluxism]

Background

Auto-GPT frequently chooses the do_nothing command with no clear indication as to why #830

Changes

This pull request adds an argument, reason to the do_nothing command. Auto-GPT will populate the argument with an explanation why the do_nothing command was chosen.

Documentation

Documented in code.

Test Plan

Ran Auto-GPT. Command arg was utilized.

PR Quality Checklist

• My pull request is atomic and focuses on a single change.
• I have thoroughly tested my changes with multiple different prompts.
• I have considered potential risks and mitigations for my changes.
• I have documented my changes clearly and comprehensively.
• I have not snuck in any "extra" small tweaks changes

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -8.06 ⚠️

Comparison is base (efc17f2) 49.40% compared to head (e5edfd5) 41.34%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3090      +/-   ##
==========================================
- Coverage   49.40%   41.34%   -8.06%     
==========================================
  Files          63       63              
  Lines        3004     3004              
  Branches      494      494              
==========================================
- Hits         1484     1242     -242     
- Misses       1400     1697     +297     
+ Partials      120       65      -55     

Impacted Files	Coverage Δ
autogpt/app.py	29.59% <0.00%> (-17.35%)	⬇️
autogpt/prompts/prompt.py	0.00% <ø> (-56.87%)	⬇️

... and 12 files with indirect coverage changes

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