refactor: startMode

[hyj1991]

Checklist

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

Affected core subsystem(s)

Deploy

Description of change

Reference: https://github.com/eggjs/egg/issues/4960

[codecov[bot]]

Codecov Report

Merging #100 (43cb9e8) into master (efa8441) will decrease coverage by 2.14%. The diff coverage is 92.41%.

@@            Coverage Diff             @@
##           master     #100      +/-   ##
==========================================
- Coverage   98.96%   96.81%   -2.15%     
==========================================
  Files           8       13       +5     
  Lines         580      723     +143     
  Branches      105      112       +7     
==========================================
+ Hits          574      700     +126     
- Misses          6       23      +17     

Impacted Files	Coverage Δ
lib/utils/options.js	97.50% <ø> (ø)
lib/utils/start_mode/worker_threads/agent.js	69.23% <69.23%> (ø)
lib/agent_worker.js	96.42% <85.71%> (-3.58%)	:arrow_down:
lib/utils/start_mode/process/agent.js	93.22% <93.22%> (ø)
lib/app_worker.js	100.00% <100.00%> (ø)
lib/master.js	100.00% <100.00%> (+1.28%)	:arrow_up:
lib/utils/manager.js	97.50% <100.00%> (+0.13%)	:arrow_up:
lib/utils/messenger.js	100.00% <100.00%> (ø)
lib/utils/start_mode/process/app.js	100.00% <100.00%> (ø)
lib/utils/start_mode/worker_threads/app.js	100.00% <100.00%> (ø)
... and 2 more

---

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[hyj1991]

还有一些测试要补下

[hyj1991]

实际测试了下，child_process 中启动的 worker_threads 调用的其它文件指令会被 nyc 忽略：

• https://github.com/eggjs/egg-cluster/pull/100/files#diff-70005bdc6996e6c69b89150d4829df5f33ecba8f279fc35c696d02cbcc6fd5adR15-R34

这里实际上已经被 lib/agent.js 在 worker_threads.test.js 的 case 中调用了，但是覆盖率不显示

[oliverzy]

麻烦问下这个pr现在可以合并了哇

[atian25]

实际测试了下，child_process 中启动的 worker_threads 调用的其它文件指令会被 nyc 忽略：

• https://github.com/eggjs/egg-cluster/pull/100/files#diff-70005bdc6996e6c69b89150d4829df5f33ecba8f279fc35c696d02cbcc6fd5adR15-R34

这里实际上已经被 lib/agent.js 在 worker_threads.test.js 的 case 中调用了，但是覆盖率不显示

换为 c8 试试，egg-bin 支持 c8 了

[fengmk2]

@hyj1991 下周再改改，我们发个 major。app worker 可以加一下线程模式，目前可以在 1 个 app worker 下使用，特别适合单测。

[hyj1991]

我来继续处理下这个 pr，如果不考虑多 worker 的形式，可以把另一半也补上

[hyj1991]

rebase 了下分支，有另一些改动有 conflict，会另开一个 PR 补上完整 worker（single） + agent 的实现