wip: add spot pod creation

- Add support for creating spot pods using the RunPod API.
- Implement `create_spot_pod` function in the `RunPod` client.
- Refactor RunPod client to handle different query types and response structures.
- Improve error handling and logging for GraphQL requests.
- Update example to demonstrate spot pod creation.

Co-authored-by: mahmmoud.hassanein <mahmmoud.hassanein@gmail.com>

examples/develop/runpod/runpod_example.vsh

@@ -10,12 +10,40 @@ mut rp := runpod.get_or_create(
 )!
 
 // Create a new pod
-pod_response := rp.create_pod(
-	name:       'RunPod Tensorflow'
-	image_name: 'runpod/tensorflow'
-	env: [
-		{"JUPYTER_PASSWORD": "rn51hunbpgtltcpac3ol"}
+// pod_response := rp.create_on_demand_pod(
+// 	name:       'RunPod Tensorflow'
+// 	image_name: 'runpod/tensorflow'
+// 	env:        [
+// 		runpod.EnvironmentVariableInput{
+// 			key:   'JUPYTER_PASSWORD'
+// 			value: 'rn51hunbpgtltcpac3ol'
+// 		},
+// 	]
+// )!
+// println('Created pod with ID: ${pod_response.id}')
+
+// create spot pod
+// "mutation { podRentInterruptable( input: { bidPerGpu: 0.2, cloudType: SECURE, gpuCount: 1, volumeInGb: 40, containerDiskInGb: 40, minVcpuCount: 2, minMemoryInGb: 15, gpuTypeId: \"NVIDIA RTX A6000\", name: \"RunPod Pytorch\", imageName: \"runpod/pytorch\", dockerArgs: \"\", ports: \"8888/http\", volumeMountPath: \"/workspace\", env: [{ key: \"JUPYTER_PASSWORD\", value: \"vunw9ybnzqwpia2795p2\" }] } ) { id imageName env machineId machine { podHostId } } }"
+spot_pod_resp := rp.create_spot_pod(
+	port:                 1826
+	bid_per_gpu:          0.2
+	cloud_type:           .secure
+	gpu_count:            1
+	volume_in_gb:         40
+	container_disk_in_gb: 40
+	min_vcpu_count:       2
+	min_memory_in_gb:     15
+	gpu_type_id:          'NVIDIA RTX A6000'
+	name:                 'RunPod Pytorch'
+	image_name:           'runpod/pytorch'
+	docker_args:          ''
+	ports:                '8888/http'
+	volume_mount_path:    '/workspace'
+	env:                  [
+		runpod.EnvironmentVariableInput{
+			key:   'JUPYTER_PASSWORD'
+			value: 'rn51hunbpgtltcpac3ol'
+		},
 	]
 )!
-
-println('Created pod with ID: ${pod_response.id}')
+println('Created spot pod with ID: ${spot_pod_resp.id}')