refactor(plugin): use standard dfs instead of topological for stable sort

[noahziheng]

Background

之前插件的按依赖排序使用了拓扑排序算法；

• 优点是有向无环图理论复杂度低，可以较容易检查循环依赖；
• 缺点是不稳定排序，可能造成 config 内锚定的无关依赖顺序漂移；

而插件排序场景中对于不能靠 dependencies 声明来实现的，较普遍使用 pluginConfig 中的顺序做依赖顺序保障，而拓扑排序使顺序漂移问题变得不易发现和处理。

Example

例如，当我们有这段配置时：

[
  { name: 'a', deps: [ 'b', 'c' ] },
  { name: 'b', deps: [ 'c' ] },
  { name: 'c', deps: [] },
  { name: 'd', deps: [ 'c' ] }
]

依赖链路为：

a -> b -> c
a -> c
b -> c
d -> c

期待的顺序为 c, b, a, d，即对于 a / d 作为无关项保持配置中的顺序；

然而，因为拓扑排序不稳定，最终顺序与依赖链长度有关（indegree 出队顺序），所以结果会是 c, b, d, a，如果 a / d 间有相互影响，将产生不可用现象

Solution

综上，有必要对该部分做出改变

该 PR 通过 DFS 重新实现 PluginFactory.createFromConfig 方法，在递归过程中进行 optional 和循环依赖检查；

同时优化了 Plugin 类的实现代码，移除了无用方法;

调整了 plugin 相关单测，顺序保证增加到 4 个，并使用上述的依赖链 case 做验证

[codecov-commenter]

Codecov Report

Patch coverage: 95.00% and project coverage change: -0.05% ⚠️

Comparison is base (6e591b4) 91.68% compared to head (993f8f0) 91.63%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #262      +/-   ##
==========================================
- Coverage   91.68%   91.63%   -0.05%     
==========================================
  Files          49       49              
  Lines        1203     1184      -19     
  Branches      213      212       -1     
==========================================
- Hits         1103     1085      -18     
+ Misses        100       99       -1     

Files Changed	Coverage Δ
src/plugin/types.ts	100.00% <ø> (ø)
src/plugin/impl.ts	80.00% <66.66%> (-6.89%)	⬇️
src/plugin/common.ts	98.00% <97.05%> (+0.38%)	⬆️
src/plugin/factory.ts	100.00% <100.00%> (+8.33%)	⬆️

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