[LIVY-785] Enable adding security related HTTP headers to responses

[andrasbeni]

What changes were proposed in this pull request?

This change introduces a new configuration option livy.server.security-headers.enabled. When this property is set to true, the following security headers are added to HTTP responses by default:

• X-XSS-Protection
• X-Frame_options
• X-Content-Type-Options

Also, adds content type information to all responses as required when using content type option nosniff

How was this patch tested?

Tested manually