feat: add getEggObjects API to fetch all instances

[sang4lv]

Checklist

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

Affected core subsystem(s)

Description of change

新增 eggObjectFactory.getEggObjects 接口，用于获取抽象类对应的所有实现。

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c24ba0c) 93.99% compared to head (d702f82) 94.01%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #189      +/-   ##
==========================================
+ Coverage   93.99%   94.01%   +0.01%     
==========================================
  Files         236      236              
  Lines        5014     5029      +15     
  Branches      541      569      +28     
==========================================
+ Hits         4713     4728      +15     
  Misses        301      301              

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[killagu]

LGTM

[killagu]

• @eggjs/aop-decorator@3.31.0
• @eggjs/controller-decorator@3.31.0
• @eggjs/core-decorator@3.31.0
• @eggjs/egg-module-common@3.31.0
• @eggjs/eventbus-decorator@3.31.0
• @eggjs/standalone-decorator@3.31.0
• @eggjs/tegg@3.31.0
• @eggjs/tegg-aop-plugin@3.31.0
• @eggjs/tegg-aop-runtime@3.31.0
• @eggjs/tegg-background-task@3.31.0
• @eggjs/tegg-common-util@3.31.0
• @eggjs/tegg-config@3.31.0
• @eggjs/tegg-controller-plugin@3.31.0
• @eggjs/tegg-dynamic-inject@3.31.0
• @eggjs/tegg-dynamic-inject-runtime@3.31.0
• @eggjs/tegg-eventbus-plugin@3.31.0
• @eggjs/tegg-eventbus-runtime@3.31.0
• @eggjs/tegg-lifecycle@3.31.0
• @eggjs/tegg-loader@3.31.0
• @eggjs/tegg-metadata@3.31.0
• @eggjs/tegg-orm-decorator@3.31.0
• @eggjs/tegg-orm-plugin@3.31.0
• @eggjs/tegg-plugin@3.31.0
• @eggjs/tegg-runtime@3.31.0
• @eggjs/tegg-schedule-decorator@3.31.0
• @eggjs/tegg-schedule-plugin@3.31.0
• @eggjs/tegg-standalone@3.31.0
• @eggjs/tegg-transaction-decorator@3.31.0