feat(loader): ignore .ts files in node_modules

[beary]

The ts files in node_modules is useless for using the framework, but errors may be reported when loading, so ignore these files in FileLoader.

Checklist

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

Affected core subsystem(s)

None

Description of change

close: https://github.com/eggjs/egg/issues/4648

[codecov[bot]]

Codecov Report

Merging #230 (52c8686) into master (99ef754) will increase coverage by 0.06%. The diff coverage is 100.00%.

:exclamation: Current head 52c8686 differs from pull request most recent head bf04fb0. Consider uploading reports for the commit bf04fb0 to get more accurate results

@@            Coverage Diff             @@
##           master     #230      +/-   ##
==========================================
+ Coverage   99.74%   99.80%   +0.06%     
==========================================
  Files          19       19              
  Lines        1177     1038     -139     
  Branches      206        0     -206     
==========================================
- Hits         1174     1036     -138     
+ Misses          3        2       -1     

Impacted Files	Coverage Δ
lib/loader/file_loader.js	100.00% <100.00%> (ø)
lib/loader/mixin/middleware.js	96.49% <0.00%> (-0.24%)	:arrow_down:
lib/egg.js	100.00% <0.00%> (ø)
lib/lifecycle.js	100.00% <0.00%> (ø)
lib/utils/index.js	100.00% <0.00%> (ø)
lib/utils/timing.js	100.00% <0.00%> (ø)
lib/utils/sequencify.js	100.00% <0.00%> (ø)
lib/loader/egg_loader.js	100.00% <0.00%> (ø)
lib/loader/mixin/config.js	100.00% <0.00%> (ø)
... and 9 more

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[fengmk2]

@beary 加一下单元测试用例？