chore(esbuild): set utf-8 charset for esbuild

[fz6m]

原因：esbuild 默认 ascii 编码产物会非常大。

See vitejs/vite#10753

[vercel]

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1 Ignored Deployment

Name	Status	Preview	Updated
umi	⬜️ Ignored (Inspect)		Dec 9, 2022 at 6:50PM (UTC)

[codecov]

Codecov Report

Base: 30.36% // Head: 30.36% // No change to project coverage 👍

Coverage data is based on head (5d065ac) compared to base (87854d8).
Patch coverage: 80.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #10021   +/-   ##
=======================================
  Coverage   30.36%   30.36%           
=======================================
  Files         432      432           
  Lines       12333    12333           
  Branches     2946     2946           
=======================================
  Hits         3745     3745           
  Misses       8027     8027           
  Partials      561      561           

Impacted Files	Coverage Δ
packages/bundler-esbuild/src/build.ts	100.00% <ø> (ø)
packages/bundler-utils/src/index.ts	0.00% <ø> (ø)
packages/bundler-vite/src/plugins/svgr.ts	52.63% <ø> (ø)
...kages/bundler-webpack/src/config/compressPlugin.ts	31.91% <ø> (ø)
packages/bundler-webpack/src/loader/svgr.ts	81.25% <ø> (ø)
packages/mfsu/src/dep/getModuleExports.ts	23.52% <ø> (ø)
packages/mfsu/src/loader/esbuild.ts	0.00% <0.00%> (ø)
packages/plugins/src/utils/modelUtils.ts	64.12% <ø> (ø)
...et-umi/src/features/apiRoute/dev-server/esbuild.ts	0.00% <ø> (ø)
...preset-umi/src/features/apiRoute/vercel/esbuild.ts	0.00% <ø> (ø)
... and 11 more

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[sorrycc]

1、对于中文场景，我理解 ascii 更好点，不会导致运行时的编码问题
2、如果要加需要用配置项加，直接改 utf-8 会有 break change

[fz6m]

已切换到 #10030