Init sub generator

[pascalgrimaud]

Related to #15490

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• All continuous integration tests are green
• Tests are added where necessary
• The JDL part is updated if necessary
• jhipster-online is updated if necessary
• Documentation is added/updated where necessary
• Coding Rules & Commit Guidelines as per our CONTRIBUTING.md document are followed

When you are still working on the PR, consider converting it to Draft (bellow reviewers) and adding skip-ci label, you can still see CI build result at your branch.

[mshima]

Sorry for the extensive review, but IMO this will make maintenance really easier.

[pascalgrimaud]

Sorry for the extensive review, but IMO this will make maintenance really easier.

@mshima : forgot to thank you for the big review. Don't be sorry for helping me on this :)
I still got some questions to finish this
And if it's faster for you to commit and push directly to my branch, don't hesitate ! Just tell me

[mshima]

And if it's faster for you to commit and push directly to my branch,

I will do that, there are a few changes I think we should do.

[pascalgrimaud]

And if it's faster for you to commit and push directly to my branch,

I will do that, there are a few changes I think we should do.

Thanks, I won't upgrade this branch, I let you apply the changes you have in mind.
I'm starting to upgrade my branch, related to the next sub generator (maven), to apply the changes you proposed here, to be consistent

[mshima]

@pascalgrimaud tell me if you don't like something.

[pascalgrimaud]

Just crazy @mshima
It looks perfect. I'll do manual test tomorrow and merge it.
Again, thanks a lot

[pascalgrimaud]

I got some error when testing it manually, related to git. It didn't manage to launch git init.
Then, because of that, npm run test test/init.spec.js failed too

09:23:09 in ~/tmp/01-beer 
➜ jhipster init
INFO! Using JHipster version installed globally
⬢ Welcome to the JHipster Init ⬢
? What is the project name of your application? Beautiful Beer Project
? What is the base name of your application? beer
? What is the default indentation? 2
? What is the Java indentation? 2
   create .prettierrc
   create .prettierignore
   create .gitignore
   create .gitattributes
   create .editorconfig
   create .huskyrc
   create package.json
    force .yo-rc.json
   create .lintstagedrc.js
   create README.md
WARNING! Failed to initialize Git repository.
 Error: fatal: ni ceci ni aucun de ses répertoires parents n'est un dépôt git : .git


Changes to package.json were detected.
Error detecting the package manager. Falling back to npm.

Running npm install for you to install the required dependencies.

added 152 packages, and audited 153 packages in 5s

30 packages are looking for funding
  run `npm fund` for details

found 0 vulnerabilities
WARNING! The generated application could not be committed to Git, as a Git repository could not be initialized.
Congratulations, JHipster execution is complete!
Sponsored with ❤️  by @oktadev.

09:23:26 in ~/tmp/01-beer took 16s 
➜ git log
fatal: ni ceci ni aucun de ses répertoires parents n'est un dépôt git : .git

[pascalgrimaud]

Thanks @mshima !