refactor(plugin): simplify impl

[noahziheng]

此 PR 简化了 Plugin 相关类的实现，对齐了统一的 Interface 命名和使用规则（*Type）

[codecov-commenter]

Codecov Report

Base: 90.68% // Head: 91.77% // Increases project coverage by +1.08% 🎉

Coverage data is based on head (05325a9) compared to base (f71fa5a).
Patch coverage: 94.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #199      +/-   ##
==========================================
+ Coverage   90.68%   91.77%   +1.08%     
==========================================
  Files          48       46       -2     
  Lines        1106     1094      -12     
  Branches      200      200              
==========================================
+ Hits         1003     1004       +1     
+ Misses        103       90      -13     

Impacted Files	Coverage Δ
src/plugin/impl.ts	84.61% <90.00%> (+5.44%)	⬆️
src/application.ts	91.17% <100.00%> (+0.26%)	⬆️
src/loader/impl/plugin_config.ts	96.15% <100.00%> (ø)
src/plugin/common.ts	100.00% <100.00%> (ø)
src/plugin/factory.ts	90.90% <100.00%> (+25.28%)	⬆️
src/plugin/index.ts	100.00% <100.00%> (ø)
src/scanner/scan.ts	95.23% <100.00%> (ø)

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