ci: [ATL-1640] add swiftlint

[goncalo-frade-iohk]

Megalinter doesnt work well with swiftlint. This issue has been reported in the ticket below.
While a solution is not provided we will go forward with having this swiftlint action and disable the
megalinter swiftlint process.
oxsecurity/megalinter#440

[github-actions]

MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ ACTION	actionlint	1		0	0.03s
✅ REPOSITORY	checkov	yes		no	6.09s
✅ REPOSITORY	devskim	yes		no	0.83s
✅ REPOSITORY	dustilock	yes		no	0.0s
✅ REPOSITORY	gitleaks	yes		no	0.15s
✅ REPOSITORY	git_diff	yes		no	0.0s
✅ REPOSITORY	secretlint	yes		no	1.22s
✅ REPOSITORY	syft	yes		no	0.32s
✅ REPOSITORY	trivy	yes		no	3.14s
✅ YAML	prettier	2		0	0.86s
✅ YAML	v8r	2		0	1.89s
✅ YAML	yamllint	2		0	0.16s

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