Update composer scripts to run only in dev mode

[netpok]

Summary

This PR updates the suggested composer integration to run only in dev environment. This should do the same as #1067 without introducing a new command.

Also the PR suggest executing the same commands in the post-install section, which can be helpful if repository is access from multiple locations or have different branches with different composer.json

The command:
[ $COMPOSER_DEV_MODE -eq 0 ] || $PHP_BINARY artisan ide-helper:generate: test that composer is not in dev mode or execute ide-helper:generate if it is.

If more readable the following is the same:
test $COMPOSER_DEV_MODE -eq 0 || $PHP_BINARY artisan ide-helper:generate

This should work under Linux, Mac and WSL (Windows).

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Misc. change (internal, infrastructure, maintenance, etc.)

Checklist

• Existing tests have been adapted and/or new tests have been added
• Add a CHANGELOG.md entry
• Update the README.md
• Code style has been fixed via composer fix-style

[mfn]

Will this work on windows? 🤔

[netpok]

Turns out no, because windows is crap

[mfn]

😬