feat: environment variable to disable plugins

[geospackle]

Change Summary

Environment variable PYDANTIC_DISABLE_PLUGINS can be used to disable all or specified plugins.

Related issue number

#7709

Checklist

• The pull request title is a good summary of the changes - it will be used in the changelog
• Unit tests for the changes exist
• Tests pass on CI
• Documentation reflects the changes where applicable
• My PR is ready to review, please add a comment including the phrase "please review" to assign reviewers

Selected Reviewer: @dmontagu

[codspeed-hq]

CodSpeed Performance Report

Merging #8767 will not alter performance

_{Comparing geospackle:am/disable-plugins (e89c7e3) with main (14ce997)}

Summary

✅ 10 untouched benchmarks

[geospackle]

please review

[geospackle]

1. Should we add a warning when plugin is disabled?
2. Is it useful to add default value 0 to enable plugins?

[sydney-runkle]

@geospackle,

Looks good overall, but we'll have to fix the tests before merging 👍. Could you please look into those errors?

[geospackle]

@geospackle,

Looks good overall, but we'll have to fix the tests before merging 👍. Could you please look into those errors?

I noticed that. Turns out globals were leaking to other tests and needed teardown on the fixture. Got the changes pushed now.

[sydney-runkle]

@geospackle,

Great, thanks! Awesome work 🚀 .