feat: add watsonx ai provider

[jinsongo]

Closes #

📑 Description

Add IBM watsonx ai as AI provider for k8sGPT.
Document: k8sgpt-ai/docs#107

✅ Checks

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed

ℹ Additional Information

The API key and project ID are hidden for security

$ k8sgpt auth add -b watsonxai -m ibm/granite-13b-chat-v2
watsonxai added to the AI backend provider list
$ export WATSONX_API_KEY=**************************
$ export WATSONX_PROJECT_ID=**************************
$ k8sgpt analyze -b watsonxai --explain

 100% || (3/3, 26 it/min)
AI Provider: watsonxai

0: Service openshift-machine-api/machine-api-controllers()
- Error: Service has no endpoints, expected label k8s-app=controller

Error: Service has no endpoints, expected label k8s-app=controller
Solution: Check the pod's annotations and ensure the label `k8s-app=controller` is present. If it's not, apply the label using the command `kubectl label pods <pod-name> k8s-app=controller`.
If the pod already has the label, check the service's selector and ensure it matches the pod's label. If it doesn't, update the service's selector using the command `kubectl apply -f <service-file>.yaml` and reapply the service.
If you're still experiencing issues, try checking the pod's status and the service's status using the command `kubectl get pods` and `kubectl get services`, respectively. This will help you identify any potential configuration issues.


1: Service openshift-machine-api/machine-api-operator-machine-webhook()
- Error: Service has no endpoints, expected label api=clusterapi
- Error: Service has no endpoints, expected label k8s-app=controller

Error: Service has no endpoints, expected label {api=clusterapi, k8s-app=controller}
Solution: Add the label "api=clusterapi" and "k8s-app=controller" to the service in the Kubernetes configuration file. This will ensure that the service has the required endpoints and labels.


2: Service openshift-machine-api/machine-api-operator-webhook()
- Error: Service has no endpoints, expected label api=clusterapi
- Error: Service has no endpoints, expected label k8s-app=controller

Error: Service has no endpoints, expected label {api=clusterapi, k8s-app=controller}
Solution: Add the label "api=clusterapi" and "k8s-app=controller" to the service in the Kubernetes configuration file. This will ensure that the service has the required endpoints and labels.