Danger integration in primary workflow

[ravi-paystack]

Using danger to enforce PR rules and also to run swift lint. Rules and actions added with this PR,

• Run swiftlint based on config file defined at .swiftlint.yml
• Show a warning if modified files are more than 50
• Show a warning if PR is marked as work in progress( if title contains WIP)
• Show a warning if PR has source files changed but no tests are changed

[github-actions[bot]]

	Warnings
:warning:	The source files were changed, but the tests remain unmodified. Consider updating or adding to the tests to match the source changes.

Generated by :no_entry_sign: Danger Swift against 096c554416caa84300f5a1745d59665ae231f489