Add CORS handler

[a-luz]

Purpose

Cors handler added for routes if enabled

Related Issues

Closes TRI-###

Submission Checklist

• Commits include the JIRA issue and the #review hashtag (e.g. TRI-### #review <comment>)
• Code passes linter rules (clj-kondo --lint src)

Testing

1. On an example project, create a routing table
2. Add the key called :cors-headers to config.edn
3. Add a route that has a key :cors set to true in the routing table
4. Run the example app and make a request to that API route. check that the headers contain the CORS headers

Screenshots