fix: bundless cache maybe broken if has dts error

[PeachScript]

修复 bundless 的持久缓存可能损坏导致下一次构建直接报错的问题

原因是写缓存的操作是异步进行的，会出现在内容还未完全写入文件系统的时候就遇到 dts error 进程退出，导致缓存内容不可用；解决方案是 bundless loader 处理文件时，等缓存完全写入后再 resolve，这样 dts 始终作为 loader 的后置逻辑执行，即便异常终止也不会影响 loader 缓存的有效性

cc @hualigushi

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b13bc23) 94.42% compared to head (bce9518) 94.43%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #725   +/-   ##
=======================================
  Coverage   94.42%   94.43%           
=======================================
  Files          55       55           
  Lines        1561     1562    +1     
  Branches      351      373   +22     
=======================================
+ Hits         1474     1475    +1     
+ Misses         87       82    -5     
- Partials        0        5    +5     

Files	Coverage Δ
src/builder/bundless/loaders/index.ts	80.95% <100.00%> (ø)
src/doctor/parser.ts	100.00% <100.00%> (ø)
src/utils.ts	98.75% <100.00%> (+0.01%)	⬆️

... and 4 files with indirect coverage changes

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