feat: Support "Copper Argos" with Athenz authentication for pulsar

[yhino]

Checklist:

• My organization is added to USERS.md.

Motivation

Support the use of Copper Argos with Athenz authentication for Pulsar.

Copper Argos is available at github.com/apache/[email protected] or later.

Modification

Copper Argos provides for an Agent running on an instance to generate a key pair and authenticate using an x509 certificate issued by Athenz.
It will not register the key pair in the Kubernetes Secret.

Modify to handle Athenz authentication settings if AuthAthenzSecret is not given.

Example Configuration

apiVersion: argoproj.io/v1alpha1
kind: EventSource
metadata:
  name: pulsar
spec:
  ...
  pulsar:
    example:
      url: pulsar+ssl://broker.example.com:6651
      topics:
        - persistent://example/example-ns/example-topic
      type: exclusive
      authAthenzParams:
        providerDomain: pulsar.test.provider
        x509CertChain: file:///generated/path/to/service.crt
        privateKey: file:///generated/path/to/private.key
        caCert: file:///etc/ssl/certs/ca-certificates.crt

ref: apache/pulsar-client-go#960