[improve][fn] Pass FunctionDetails to Go instance

[jiangpengcheng]

Fixes #22349

Main Issue: #xyz

PIP: #xyz

Motivation

The Go instance doesn't get the full FunctionDetails, which makes it missing many features like Java and Python

Modifications

Pass the FunctionDetails string directly to Go and unmarshal it to the FunctionDetails struct

Verifying this change

• Make sure that the change passes the CI checks.

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

  • org.apache.pulsar.tests.integration.functions.go.PulsarFunctionsGoProcessTest
  • org.apache.pulsar.tests.integration.functions.go.PulsarFunctionsGoThreadTest
  • org.apache.pulsar.functions.runtime.kubernetes.KubernetesRuntimeTest

• This change added tests and can be verified as follows:

  • Added unit test for config with valid, invalid, and empty "FunctionDetails"

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

If the box was checked, please highlight the changes

• Dependencies (add or upgrade a dependency)
• The public API
• The schema
• The default values of configurations
• The threading model
• The binary protocol
• The REST endpoints
• The admin CLI options
• The metrics
• Anything that affects deployment

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

Matching PR in forked repository

PR in forked repository: jiangpengcheng#31