Enable denylist handling for plugins

[lc0rp]

Background

Currently, only ALLOWLISTED_PLUGINS read from env.

As more plugins are created, you have to click "n" for each plugin you don't want to use - enabling DENYLISTED_PLUGINS will increase usability.

There is another PR: 3254 enables this env variable, but also changes the env variable and Config field names, making it potentially more disruptive to users.

Changes

Instead of only reading in the allowlist, the code has been updated to check for a DENYLISTED_PLUGINS environment variable and, if found, populate a plugins_denylist attribute on the Config class with its contents.

Documentation

The plugin documentation in the plugin repo will need to be updated to mention this setting. I'll do that as a separate PR.

Test Plan

I have tested with existing tests and local manual testing. Existing tests cover this change.

PR Quality Checklist

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

No new tests

• Existing tests cover this change.
• Additionally, the Config singleton would be affected, which could lead to other tests failing.

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Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)	Visit Preview		May 4, 2023 2:09am

[codecov[bot]]

Codecov Report

Patch coverage: 77.77% and project coverage change: +0.03 :tada:

Comparison is base (911cea7) 60.92% compared to head (2ce62bc) 60.96%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3688      +/-   ##
==========================================
+ Coverage   60.92%   60.96%   +0.03%     
==========================================
  Files          72       72              
  Lines        3294     3302       +8     
  Branches      541      542       +1     
==========================================
+ Hits         2007     2013       +6     
- Misses       1150     1151       +1     
- Partials      137      138       +1     

Impacted Files	Coverage Δ
autogpt/config/config.py	74.85% <50.00%> (-0.76%)	:arrow_down:
autogpt/plugins.py	75.36% <100.00%> (+0.92%)	:arrow_up:

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