[improve] expose RuntimeFlags for Pulsar Functions and Connectors

[freeznet]

(If this PR fixes a github issue, please add Fixes #<xyz>.)

Fixes #

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Motivation

The runtimeFlags is been used to allow user to customize the java options for both Kubernetes Runtime & Process runtime, the config can be passed by YAML or JSON via pulsarctl, but not been exposed as any option in CLI.

Modifications

Describe the modifications you've done.

Verifying this change

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(Please pick either of the following options)

This change is a trivial rework / code cleanup without any test coverage.

(or)

This change is already covered by existing tests, such as (please describe tests).

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This change added tests and can be verified as follows:

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• Added integration tests for end-to-end deployment with large payloads (10MB)
• Extended integration test for recovery after broker failure

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): (yes / no)
• The public API: (yes / no)
• The schema: (yes / no / don't know)
• The default values of configurations: (yes / no)
• The wire protocol: (yes / no)

Documentation

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