chore(core/loader): use tegg-metadata EggLoadUnitType enum

[nightink]

• fix(core/lifecycle): typo

Checklist

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

Affected core subsystem(s)

Description of change

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (04fabef) 92.52% compared to head (b279758) 92.53%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #176   +/-   ##
=======================================
  Coverage   92.52%   92.53%           
=======================================
  Files         235      235           
  Lines        5020     5021    +1     
  Branches      539      539           
=======================================
+ Hits         4645     4646    +1     
  Misses        375      375           

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[killagu]

这需要从长计议一下了，目前 tegg 中容易引起 npm 的循环依赖，得做一下改造。