refactor: divide subscribeToConfigPod method to manage GRPC server connection separately inside the modules

[gatici]

The aim of this change is managing the GRPC server connection separately inside the modules.
This PR refactors ConfClient interface methods which is used to subscribe to Config pod NMS.
refactor:

• add ConnectToGrpcServer method to ConfClient interface
• change signatures of PublishOnConfigChange and subsribeToConfigPod methods

After getting updated this library, the necessary changes will be done in every module to solve the GRPC client re-connection issue.
These changes are done to solve the following problem:

If the Webconsole is restarted, other modules loses the GRPC connection to Webconsole
They tries to connect again for hours with no success.

2024-09-26T11:32:10.014Z [smf] 2024-09-26T11:32:10Z [ERRO][Config5g][GRPC] Connectivity status idle, trying to connect again.

Please check the implementation in NF side: omec-project/nrf#132

[thakurajayL]

Could you please suggest one example how NFs are going to use these updated APIs? This will help in doing effective code review.

[gatici]

Could you please suggest one example how NFs are going to use these updated APIs? This will help in doing effective code review.

Hello @thakurajayL ,
This PR shows how to use updated config5G library: omec-project/nrf#132

[gab-arrobo]

@gatici, please rebase your PR and also, I understand that you/we need to create a new tag/release for the NFs to start using these changes. If so, please also make the appropriate change in the VERSION file to create a release (major, minor or patch, as you deem appropriate) as part of this PR, ok?

[gatici]

@gatici, please rebase your PR and also, I understand that you/we need to create a new tag/release for the NFs to start using these changes. If so, please also make the appropriate change in the VERSION file to create a release (major, minor or patch, as you deem appropriate) as part of this PR, ok?

@thakurajayL @gab-arrobo PR is rebased and version file is updated.

[gab-arrobo]

LGTM