[chore] add example showcasing multimetrics format for platform metri…

…cs (#1222)

examples/multi-metrics/README.md

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+# Example of chart configuration
+
+## Use multi-metric format when sending metrics to Splunk Platform
+
+The HEC multi-metric format combines multiple metrics in the same HEC metrics payload to optimize transfer.

examples/multi-metrics/enable-multi-metrics-values.yaml

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+clusterName: CHANGEME
+
+splunkPlatform:
+  endpoint: CHANGEME
+  token: CHANGEME
+  metricsIndex: CHANGEME
+  metricsEnabled: true
+
+agent:
+  config:
+    exporters:
+      splunk_hec/platform_metrics:
+        use_multi_metric_format: true

examples/multi-metrics/rendered_manifests/clusterRole.yaml

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+---
+# Source: splunk-otel-collector/templates/clusterRole.yaml
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: default-splunk-otel-collector
+  labels:
+    app.kubernetes.io/name: splunk-otel-collector
+    helm.sh/chart: splunk-otel-collector-0.96.0
+    app.kubernetes.io/managed-by: Helm
+    app.kubernetes.io/instance: default
+    app.kubernetes.io/version: "0.96.1"
+    app: splunk-otel-collector
+    chart: splunk-otel-collector-0.96.0
+    release: default
+    heritage: Helm
+rules:
+- apiGroups:
+  - ""
+  resources:
+  - events
+  - namespaces
+  - namespaces/status
+  - nodes
+  - nodes/spec
+  - nodes/stats
+  - nodes/proxy
+  - pods
+  - pods/status
+  - persistentvolumeclaims
+  - persistentvolumes
+  - replicationcontrollers
+  - replicationcontrollers/status
+  - resourcequotas
+  - services
+  verbs:
+  - get
+  - list
+  - watch
+- apiGroups:
+  - apps
+  resources:
+  - daemonsets
+  - deployments
+  - replicasets
+  - statefulsets
+  verbs:
+  - get
+  - list
+  - watch
+- apiGroups:
+  - extensions
+  resources:
+  - daemonsets
+  - deployments
+  - replicasets
+  verbs:
+  - get
+  - list
+  - watch
+- apiGroups:
+  - batch
+  resources:
+  - jobs
+  - cronjobs
+  verbs:
+  - get
+  - list
+  - watch
+- apiGroups:
+    - autoscaling
+  resources:
+    - horizontalpodautoscalers
+  verbs:
+    - get
+    - list
+    - watch
+- nonResourceURLs:
+  - /metrics
+  verbs:
+  - get
+  - list
+  - watch

examples/multi-metrics/rendered_manifests/clusterRoleBinding.yaml

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+---
+# Source: splunk-otel-collector/templates/clusterRoleBinding.yaml
+kind: ClusterRoleBinding
+apiVersion: rbac.authorization.k8s.io/v1
+metadata:
+  name: default-splunk-otel-collector
+  labels:
+    app.kubernetes.io/name: splunk-otel-collector
+    helm.sh/chart: splunk-otel-collector-0.96.0
+    app.kubernetes.io/managed-by: Helm
+    app.kubernetes.io/instance: default
+    app.kubernetes.io/version: "0.96.1"
+    app: splunk-otel-collector
+    chart: splunk-otel-collector-0.96.0
+    release: default
+    heritage: Helm
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: default-splunk-otel-collector
+subjects:
+- kind: ServiceAccount
+  name: default-splunk-otel-collector
+  namespace: default