Feat nodejs: Added Nodejs Conversion

[vanisrikanithi]

Nodejs go-conversion:
Added "Nodejs" support to go-convert specific to jenkins migration.

Nodejs Jenkins Trace:
Test_Nodejs_plugin__4.json

go run main.go jenkinsjson --downgrade ~/go/Test_Nodejs_plugin__4.json

Harness Nodejs test pipeline here.
Nodejs harness pipeline step:

- step:
    identifier: stagenull99086b
    name: Nodejs
    spec:
      command: |
        npm --version
        npm install
      image: node:latest
      shell: Sh
    timeout: ""
    type: Run

[vanisrikanithi]

Hello @Ompragash,

Could you please review the nodejs conversion step, and provide your comments on this if there are any?

Thank you.

[vanisrikanithi]

@Ompragash Could you please review the Nodejs Conversion step and provide your review comments on this?

Thanks.