feat: export EggModuleLoader in standalone

[popomore]

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

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (0862655) 93.77% compared to head (4a78705) 93.77%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #146   +/-   ##
=======================================
  Coverage   93.77%   93.77%           
=======================================
  Files         227      227           
  Lines        4738     4739    +1     
  Branches      509      509           
=======================================
+ Hits         4443     4444    +1     
  Misses        295      295           

Files Changed	Coverage Δ
standalone/standalone/index.ts	100.00% <100.00%> (ø)

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[killagu]

• @eggjs/aop-decorator@3.16.0
• @eggjs/controller-decorator@3.16.0
• @eggjs/core-decorator@3.16.0
• @eggjs/egg-module-common@3.16.0
• @eggjs/eventbus-decorator@3.16.0
• @eggjs/standalone-decorator@3.16.0
• @eggjs/tegg@3.16.0
• @eggjs/tegg-aop-plugin@3.16.0
• @eggjs/tegg-aop-runtime@3.16.0
• @eggjs/tegg-background-task@3.16.0
• @eggjs/tegg-common-util@3.16.0
• @eggjs/tegg-config@3.16.0
• @eggjs/tegg-controller-plugin@3.16.0
• @eggjs/tegg-dynamic-inject@3.16.0
• @eggjs/tegg-dynamic-inject-runtime@3.16.0
• @eggjs/tegg-eventbus-plugin@3.16.0
• @eggjs/tegg-eventbus-runtime@3.16.0
• @eggjs/tegg-lifecycle@3.16.0
• @eggjs/tegg-loader@3.16.0
• @eggjs/tegg-metadata@3.16.0
• @eggjs/tegg-orm-decorator@3.16.0
• @eggjs/tegg-orm-plugin@3.16.0
• @eggjs/tegg-plugin@3.16.0
• @eggjs/tegg-runtime@3.16.0
• @eggjs/tegg-schedule-decorator@3.16.0
• @eggjs/tegg-schedule-plugin@3.16.0
• @eggjs/tegg-standalone@3.16.0
• @eggjs/tegg-transaction-decorator@3.16.0