chore: Add icon size and stroke width props

[at-susie]

Description

This PR adds sizes and strokeWidths props to the IconProvider component, enabling customization of icon sizes and stroke widths at any scope in the component tree.

Related links, issue #, if available: n/a

How has this been tested?

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

❌ Patch coverage is 41.46341% with 48 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.26%. Comparing base (f493264) to head (5e73292).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/icon-provider/internal.tsx	26.31%	28 Missing ⚠️
src/icon/internal.tsx	52.38%	19 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4514      +/-   ##
==========================================
- Coverage   97.41%   97.26%   -0.16%     
==========================================
  Files         933      936       +3     
  Lines       29595    29692      +97     
  Branches    10757    10794      +37     
==========================================
+ Hits        28831    28880      +49     
- Misses        716      804      +88     
+ Partials       48        8      -40     

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