Add common authentication methods to Logstash Output

At current the Logstash Output for the ESF does not support authentication methods other than Username:Password.
Based on common Logstash use cases I see with my customers the output should also support TLS, PKI and Client Certificates.

[Functionbeat has this functionality](https://github.com/elastic/beats/blob/main/x-pack/functionbeat/functionbeat.reference.yml#L832) but goes EoL this October leaving no options for customers who use the above authentication methods with a Serverless Cloud Native mindset.