refactor: improve internal usage of environment variables with prepared env

[alan910127]

Closes #141

Summary

• Created an exported environment variable access object called env
• Prepare the types and default values on the env object

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Latest commit: d3ad967173a31e07d3789f831d51140fcae0db1c

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[JounQin]

Sorry you'll need to add a moduleNameMapper for jest:

{
  "moduleNameMapper": {
    "^(\\.{1,2}/.*)\\.js$": "$1"
  }
}

[JounQin]

It's really a great PR, thanks @alan910127 !

[JounQin]

By the way, the commit subject should be refactor, it doesn't change any runtime behavior.

[JounQin]

Thanks again, and sorry for my nitpicking.