Restructure api folder

[Karthik-K-N]

/kind feature
/area provider/ibmcloud

User Story

What would you like to be added?

Cluster-api suggests to avoid dependency on controller-runtime while registering scheme and also move out the webhooks from api to avoid unnecessary dependency for consumer.

More info about it can be found here: kubernetes-sigs/cluster-api#9011

CAPI guide to register scheme: https://cluster-api.sigs.k8s.io/developer/providers/getting-started/implement-api-types#registering-apis-in-the-scheme

Example: "As a [developer/user/operator], I would like to [high-level description] for [reasons]."

Detailed Feature Description

Provide a clear and concise description of the new feature or the improvement to an existing feature.

This will be an umbrella issue and can be be linked to multiple PRs to achieve the intended goal.

Context & Motivation

What problem does this solve, and why is it important?
Explain the motivation behind this request. How does this feature improve the project? What specific use cases does it address?

Proposed Solution

How should this be implemented?
Describe potential approaches for implementing this feature. If possible, provide links to related documentation or prior discussions.

Alternatives Considered

Have you considered any alternatives?
List any alternative solutions or workarounds you've considered and explain why they may or may not be suitable.

Additional Information

Anything else you would like to add?
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[Prajyot-Parab]

/assign @Karthik-K-N