[Metric]Flink-Metrics pushgateway support authentication

[littlecatjianjiao]

the issues :https://issues.apache.org/jira/browse/FLINK-27661

What is the purpose of the change

We found that the native PushGateway does not support authentication. As a result, the metrics data in on YARN mode cannot be reported to pushGateway with authentication.
Although we have some other solutions, such as landing files and others, we think pushGateway is the best solution.
This pull request makes the pushgateway support authentication

Brief change log

makes the PrometheusPushGatewayReporter support authentication

Verifying this change

I have verified that we can present our metric data nicely by using pushGateway, which requires authentication

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

• Dependencies (does it add or upgrade a dependency): (no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (no)
• The serializers: (no)
• The runtime per-record code paths (performance sensitive): (no)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (no)
• The S3 file system connector: (no)

Documentation

• Does this pull request introduce a new feature? (no)
• If yes, how is the feature documented? (docs)

[flinkbot]

CI report:

• cdee46a Azure: CANCELED

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