feat(types): update types of utils.ts

[waitingsong]

ref: #258

Checklist

• npm test passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines

Affected core subsystem(s)

Description of change

给 packages/midway-web/src/utils.ts 增加类型

[codecov-io]

Codecov Report

Merging #259 into master will increase coverage by 0.01%.
The diff coverage is 91.66%.

@@            Coverage Diff             @@
##           master     #259      +/-   ##
==========================================
+ Coverage   88.47%   88.49%   +0.01%     
==========================================
  Files          35       35              
  Lines         668      669       +1     
  Branches       43       44       +1     
==========================================
+ Hits          591      592       +1     
  Misses         68       68              
  Partials        9        9

Impacted Files	Coverage Δ
packages/midway-web/src/utils.ts	100% <100%> (ø)	⬆️
packages/midway-web/src/loader/webLoader.ts	90.9% <85.71%> (+0.08%)	⬆️

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