fix(types): support object format for PackageJson .browser

[imranbarbhuiya]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ 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

According to https://github.com/defunctzombie/package-browser-field-spec, browser field can be a string, an object with string | false value. This PR adds the object support.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[codecov]

Codecov Report

Merging #145 (d13c222) into main (b1f6536) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #145   +/-   ##
=======================================
  Coverage   89.40%   89.40%           
=======================================
  Files           5        5           
  Lines         434      434           
  Branches       37       37           
=======================================
  Hits          388      388           
  Misses         46       46           

Files	Coverage Δ
src/types/packagejson.ts	100.00% <100.00%> (ø)

[imranbarbhuiya]

@pi0 can u please merge this pr as I need it in my project