Add monitoring mixin for temporal

temporal-mixin/.lint

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+exclusions:
+    panel-title-description-rule:
+        reason: Removed panel title for visual appearance for top stats panels
+    target-instance-rule:
+        reason: Temporal instance filtering is accomplished by the namespace
+    template-instance-rule:
+        reason: Temporal instance filtering is accomplished by the namespace
+    target-job-rule:
+        reason: Hosted exporter jobs
+    template-job-rule:
+        reason: Hosted exporter jobs

temporal-mixin/README.md

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+# Temporal Mixin
+
+A Grafana dashboard mixin for monitoring Temporal usage.
+
+## Usage
+
+Import this mixin in your jsonnet configuration:
+
+```jsonnet
+local temporalMixin = import 'temporal-mixin/mixin.libsonnet';
+
+temporalMixin.grafanaDashboards
+```