feat: add otel memory metrics dashboard

otel-agent/dashboards/otel-memory-metrics-8.x.ndjson

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otel-agent/dashboards/readme.md

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+## Opentelemetry Dashboards and Visualizations
+
+A Kibana dashboard displays a collection of visualizations and searches.
+This is a collection of dashboards, visualizations, and searches that you can use to organize and view your Opentelemetry Agent data.
+
+### Installation
+
+Dashboards are imported on the **Stack Management > Saved Objects** page.
+Full documentation on this process is available in [Kibana](https://www.elastic.co/guide/en/kibana/current/managing-saved-objects.html).
+
+After importing, visit the [Dashboard](https://www.elastic.co/guide/en/kibana/current/dashboard.html) tab to view and edit your imported dashboards.
+
+
+### Dashboards
+
+List provided here may contain dashboards for metrics that are the same across different
+languages (semantic convention is shared) and also language specific ones (like JVM metrics).
+
+- [**otel-memory-metrics-8.x.ndjson**](otel-memory-metrics-8.x.ndjson). Dashboard exported from an
+Elastic deployment with verison `v8.10.2`. The dashboard contains two panels to display the following memory metrics.
+  - `system.memory.usage` showing the amount af free/used bytes.
+  - `system.memory.utilization` showing the percentage of memory being used.
+
+![memory_metrics_dashboard](../assets/otel-dashboard-memory-metrics.png)