chore: add src into package files

[erha19]

Types

• 🧹 Chores

Background or solution

本身 @opensumi/ide-* 构建后的源码也非最终构建代码，可以保留源码方便用户调试时查看

close #1454

Changelog

[codecov]

Codecov Report

Base: 57.63% // Head: 57.61% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (3b0305c) compared to base (7821551).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1949      +/-   ##
==========================================
- Coverage   57.63%   57.61%   -0.02%     
==========================================
  Files        1286     1286              
  Lines       80534    80534              
  Branches    16855    16855              
==========================================
- Hits        46413    46397      -16     
- Misses      31039    31052      +13     
- Partials     3082     3085       +3     

Flag	Coverage Δ
jsdom	52.36% <ø> (-0.04%)	⬇️
node	15.88% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...es/src/browser/userstorage/user-storage.service.ts	58.24% <0.00%> (-14.29%)	⬇️
...c/browser/abstract-resource-preference-provider.ts	82.55% <0.00%> (-1.75%)	⬇️

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