refactor!: remove unused runtime utilities and simplify code

[danielroe]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

this is a set of performance related changes that decreases bundle size + deduplicates code

[cloudflare-workers-and-pages]

Deploying nuxt-image with    Cloudflare Pages

Latest commit:	c44128b
Status:	✅  Deploy successful!
Preview URL:	https://73f2f024.nuxt-image.pages.dev
Branch Preview URL:	https://refactor-cleanup.nuxt-image.pages.dev

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[pkg-pr-new]

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npm i https://pkg.pr.new/@nuxt/image@1816

commit: c44128b

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 96.77419% with 3 lines in your changes missing coverage. Please review.

Project coverage is 63.15%. Comparing base (c4bba1b) to head (c44128b).
Report is 19 commits behind head on main.

Files with missing lines	Patch %	Lines
src/runtime/utils/index.ts	80.00%	2 Missing ⚠️
src/runtime/components/NuxtPicture.vue	97.14%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1816      +/-   ##
==========================================
+ Coverage   62.97%   63.15%   +0.17%     
==========================================
  Files          77       77              
  Lines        3795     3745      -50     
  Branches      433      429       -4     
==========================================
- Hits         2390     2365      -25     
+ Misses       1378     1353      -25     
  Partials       27       27              

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