lazily read package.json.browser_fields for shared resolvers

[Boshen]

No description provided.

[codspeed-hq]

CodSpeed Performance Report

Merging #142 will degrade performances by 29.15%

_{Comparing browser-field-refactor2 (35b482f) with main (b887e55)}

Summary

❌ 2 regressions

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	browser-field-refactor2	Change
❌	resolver[multi-thread]	2 ms	2.8 ms	-26.48%
❌	resolver[single-thread]	1.8 ms	2.5 ms	-29.15%

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.08%. Comparing base (b887e55) to head (35b482f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #142      +/-   ##
==========================================
+ Coverage   96.03%   96.08%   +0.05%     
==========================================
  Files          11       11              
  Lines        2272     2276       +4     
==========================================
+ Hits         2182     2187       +5     
+ Misses         90       89       -1     

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