feat(csp): support style nonce in development

[dargmuesli]

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

Allows to use "'nonce-{{nonce}}'" placeholder on style-src policy in development.
Resolves discussion #454.

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes (if not applicable, please state why)

Not sure how to run tests for development mode.

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Name	Status	Preview	Comments	Updated (UTC)
nuxt-security	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 12, 2024 10:08am

[dargmuesli]

@vejja @GalacticHypernova would you be so kind to review? 🙏

[dargmuesli]

I've tested this change in my projects and it works fine. Without this change having a nonce in style-src results in

With this change there is no such error in development any more 🥳

[GalacticHypernova]

Seems good to me at a first glance, will do some local testing soon. Thanks for making this PR! I was planning on making it but got a little busy with life.