Add Laravel installer

[llaville]

Superceeded to PR #19 (thanks to @ericp-mrel for first contribution)

[github-actions]

MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ CREDENTIALS	secretlint	yes		no	2.84s
✅ EDITORCONFIG	editorconfig-checker	yes		no	1.64s
✅ JSON	eslint-plugin-jsonc	1		0	1.04s
✅ JSON	prettier	1		0	1.19s
✅ MARKDOWN	markdownlint	2		0	0.37s
✅ PHP	phpcs	1		0	0.09s
✅ PHP	phpstan	yes		no	2.53s

See errors details in artifact MegaLinter reports on GitHub Action page
Set VALIDATE_ALL_CODEBASE: true in mega-linter.yml to validate all sources, not only the diff

[llaville]