[Change] use environment variable in package.json

[ROBOTofficial]

Use environment variable in package.json

I have already finished analyzing the relevant code and am struggling with the implementation details.
Please see draft plans for details.

Draft Plans

"scripts": {
    "plan1": "echo $MESSAGE",
    "plan2": "echo ${MESSAGE}",
    "plan3": "echo ${ENV.MESSAGE}",
    "plan4": "echo $ENV.MESSAGE",
    "plan5": "echo $ENV{MESSAGE}"
}

I would like to hear everyone's opinion on this.
I will send out a pull request as soon as the details are finalized in this issue.

My first language is Japanese and I live in Japan
My English may be sloppy at times, but I hope you understand.