feat: Adds option for nonce support

[benjackwhite]

Changes

Solves https://posthog.com/questions/how-to-set-nonce-for-recorder-and-surveys-scripts

Adds a new option for modifying scripts before external loading, in this case for adding a nonce

Checklist

• Tests for new code (see advice on the tests we use)
• Accounted for the impact of any changes across different browsers
• Accounted for backwards compatibility of any changes (no breaking changes in posthog-js!)

[vercel]

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Name	Status	Preview	Updated (UTC)
posthog-js	✅ Ready (Inspect)	Visit Preview	Dec 25, 2024 6:49pm

[github-actions]

Size Change: +978 B (+0.03%)

Total Size: 3.22 MB

Filename	Size	Change
dist/array.full.js	365 kB	+163 B (+0.04%)
dist/array.js	179 kB	+163 B (+0.09%)
dist/external-scripts-loader.js	2.64 kB	+163 B (+6.59%)	🔍
dist/main.js	180 kB	+163 B (+0.09%)
dist/module.full.js	365 kB	+163 B (+0.04%)
dist/module.js	179 kB	+163 B (+0.09%)

ℹ️ View Unchanged

Filename	Size
dist/all-external-dependencies.js	206 kB
dist/array.full.es5.js	262 kB
dist/array.full.no-external.js	364 kB
dist/array.no-external.js	178 kB
dist/customizations.full.js	12.6 kB
dist/dead-clicks-autocapture.js	14.4 kB
dist/exception-autocapture.js	9.48 kB
dist/module.full.no-external.js	364 kB
dist/module.no-external.js	178 kB
dist/recorder-v2.js	115 kB
dist/recorder.js	115 kB
dist/surveys-preview.js	57.6 kB
dist/surveys.js	63.3 kB
dist/tracing-headers.js	1.76 kB
dist/web-vitals.js	10.4 kB

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