feat(preview): add --port option for previewing

[Saeid-Za]

🔗 Linked issue

resolves #721

❓ 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 PR adds --port, -p option to preview command, for it to be consistent with dev command an a little better DX in compared to providing an environment variable.

[pkg-pr-new]

Open in Stackblitz

npm i https://pkg.pr.new/create-nuxt-app@724

npm i https://pkg.pr.new/@nuxt/cli@724

npm i https://pkg.pr.new/nuxi@724

commit: 46304ca

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 4.00000% with 24 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@b8281cb). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
packages/nuxi/src/commands/preview.ts	4.00%	24 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #724   +/-   ##
=======================================
  Coverage        ?   13.48%           
=======================================
  Files           ?       66           
  Lines           ?     3374           
  Branches        ?       96           
=======================================
  Hits            ?      455           
  Misses          ?     2889           
  Partials        ?       30           

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[danielroe]

Thank you ❤️