support jwt and trusted cert for pulsar perf client

[zzzming]

Motivation

Add token/JWT and trusted certificate support in Pulsar perf go client. So that it can be used in production environment.

Modifications

Implement pulsar-perf-go command line arguments for token-file and trusted-cert-file. These two arguments are optional. There is no change to the default non-TLS and no auth configuration.

Verifying this change

This is a change to Pulsar perf go client. It should pass build and existing test cases.

Does this pull request potentially affect one of the following parts:

If yes was chosen, please highlight the changes

• Dependencies (does it add or upgrade a dependency): no
• The public API: no
• The schema: no
• The default values of configurations: no
• The wire protocol: no

Documentation

• Does this pull request introduce a new feature? no
• If yes, how is the feature documented? (not applicable / docs / GoDocs / not documented)
• If a feature is not applicable for documentation, explain why?
• If a feature is not documented yet in this PR, please create a followup issue for adding the documentation