feat: [AH-758]: Onboard Harness Artifact Registry

[ritek01]

Describe your changes

Onboarded Harness Artifact Registry Api to GO-SDK for Onboarding of Terraform.
https://apidocs.harness.io/tag/Registries

Terraform Provider Pr : harness/terraform-provider-harness#1146

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[ritek01]

Using new api Locally is working.

[shivamnegi94]

are all the doc files added are required ?

[shivamnegi94]

Usually we keep all the files inside the package https://github.com/harness/harness-go-sdk/tree/main/harness/nextgen
any reason we are not keeping on the same place ?

[ritek01]

Usually we keep all the files inside the package https://github.com/harness/harness-go-sdk/tree/main/harness/nextgen any reason we are not keeping on the same place ?

The new module is in a separate folder to make maintenance easier and to avoid messing with the existing package. I have followed same approach that was done for DBDevOps and Code modules, so this keeps things clean and organized without risking issues with what's already there.