feat: Add REST API endpoints to created, update and delete SKUs

[thossain-nv]

Is this a new feature, an enhancement, or a change to existing functionality?

Enhancement

How would you describe the priority of this feature request

Medium

Please provide a clear description of problem this feature solves

Currently NICo REST API only allows retrieval of existing SKUs. We need support to create, update and delete SKUs.

Feature Description

Following API endpoints should be added:

• Create SKU Endpoint: POST /v2/org/org/nico/sku
• Update SKU Endpoint: PATCH /v2/org/org/nico/sku/:skuId
• Delete SKU Endpoint: DELETE /v2/org/org/nico/sku/:skuId

Describe your ideal solution

No response

Describe any alternatives you have considered

No response

Additional context

No response

Code of Conduct

• I agree to follow NVIDIA Infra Controller's Code of Conduct
• I have searched the open feature requests and have found no duplicates for this feature request