feat: local plugin resolve support .ts files

[hzgotb]

如果是相对路径的话，应该是可以使用ts去写插件的。

Checklist

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

Description of change

• any feature?
• close https://github.com/umijs/umi/ISSUE_URL

[netlify]

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Built with commit 19dd6f9

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[codecov]

Codecov Report

Merging #4107 into master will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4107   +/-   ##
=======================================
  Coverage   83.98%   83.98%           
=======================================
  Files         129      129           
  Lines        2547     2547           
  Branches      640      640           
=======================================
  Hits         2139     2139           
  Misses        400      400           
  Partials        8        8           

Impacted Files	Coverage Δ
packages/core/src/Service/utils/pluginUtils.ts	92.95% <ø> (ø)

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