Add auditor role

[sandromello]

This Pull Request refactor the gin routes and introduces the auditor role that allow accessing session endpoints.

• Removed unused code

[sentry-io[bot]]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ *errors.errorString: failed creating guard rail association, reason=ERROR: invalid input syntax for type uuid: "" (SQL... github.com/hoophq/hoop/gateway/api/connections ... View Issue
• ‼️ *errors.errorString: status=400, response={"code":"22P02","details":null,"hint":null,"message":"invalid input syntax f... github.com/hoophq/hoop/gateway/api/session in Get View Issue
• ‼️ runtime.errorString: runtime error: invalid memory address or nil pointer dereference github.com/hoophq/hoop/gateway/api/session in Post View Issue

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