feat: add gcp cloud functions and app engine dashboards

gcp/app-engine/README.md

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+# GCP App Engine Dashboard - OTLP
+
+## Data Ingestion
+
+### Integrate GCP App Engine with OpenTelemetry Collector and SigNoz
+
+Follow the instructions [here](https://signoz.io/docs/gcp-monitoring/app-engine/metrics/) about integrating OpenTelemetry with GCP App Engine.
+
+## Dashboard panels
+
+## Variables
+
+- `{{deployment_environment}}`: The deployment.environment for the service.
+- `{{project_id}}`: GCP Project ID
+
+### Sections
+
+- Instance Metrics
+  - Instance CPU Utilization - `appengine_googleapis_com_flex_instance_cpu_utilization`
+  - Screenshot of Instance Metrics Section - ![GCP App Engine Instance Metrics Section Screenshot](assets/instance-metrics-section.png)
+- Network Section
+  - Received Bytes Count - `appengine_googleapis_com_flex_instance_network_received_bytes_count`
+  - Sent Bytes Count - `appengine_googleapis_com_flex_instance_network_sent_bytes_count`
+  - Screenshot of Network Section - ![GCP App Engine Network Section Screenshot](assets/network-section.png)
+- HTTP Server Section
+  - Response Count - `appengine_googleapis_com_http_server_response_count`
+  - Response Latencies - `appengine_googleapis_com_http_server_response_latencies`
+  - Quota Denial Count - `appengine_googleapis_com_http_server_quota_denial_count`
+  - Screenshot of HTTP Server Section - ![GCP App Engine HTTP Server Section Screenshot](assets/http-server-section.png)

gcp/cloud-functions/README.md

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+# GCP Cloud Functions Dashboard - OTLP
+
+## Data Ingestion
+
+### Integrate GCP Cloud Functions with OpenTelemetry Collector and SigNoz
+
+Follow the instructions [here](https://signoz.io/docs/gcp-monitoring/gcp-fns/fns-metrics/) about integrating OpenTelemetry with GCP Cloud Functions.
+
+## Dashboard panels
+
+## Variables
+
+- `{{deployment_environment}}`: The deployment.environment for the service.
+- `{{project_id}}`: GCP Project ID
+
+
+### Sections
+
+- Execution Count - `cloudfunctions_googleapis_com_function_execution_count`
+- Execution Times - `cloudfunctions_googleapis_com_function_execution_times`
+- Instance Count - `cloudfunctions_googleapis_com_function_instance_count`
+- Active Instances - `cloudfunctions_googleapis_com_function_active_instances`
+- User Memory Bytes - `cloudfunctions_googleapis_com_function_user_memory_bytes`
+- Network Egress - `cloudfunctions_googleapis_com_function_network_egress`
+- Screenshot of GCP Cloud Functions Dashboard - ![GCP Cloud Functions Dashboard Screenshot](assets/dashboard-cloud-function.png)

gcp/compute-engine/README.md

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+# GCP Compute Engine Dashboard - OTLP
+
+## Data Ingestion
+
+### Integrate GCP Compute Engine with OpenTelemetry Collector and SigNoz
+
+Follow the instructions [here](https://signoz.io/docs/gcp-monitoring/compute-engine/metrics/) about integrating OpenTelemetry with GCP Compute Engine.
+
+## Dashboard panels
+
+## Variables
+
+- `{{deployment_environment}}`: The deployment.environment for the service.
+- `{{project_id}}`: GCP Project ID
+
+### Sections
+
+- CPU Metrics Section
+  - CPU Usage Time - `compute_googleapis_com_instance_cpu_usage_time`
+  - CPU Utilization - `compute_googleapis_com_instance_cpu_utilization`
+  - Screenshot of CPU Metrics Section - ![GCP Compute Engine CPU Metrics Section Screenshot](assets/cpu-metrics-section.png)
+- Disk Metrics Section
+  - Read Operations Count - `compute_googleapis_com_instance_disk_read_ops_count`
+  - Write Operations Count - `compute_googleapis_com_instance_disk_write_ops_count`
+  - Screenshot of Disk Metrics Section - ![GCP Compute Engine Disk Metrics Section Screenshot](assets/disk-metrics-section.png)
+- Network Metrics Section
+  - Received Bytes Count - `compute_googleapis_com_instance_network_received_bytes_count`
+  - Sent Bytes Count - `compute_googleapis_com_instance_network_sent_bytes_count`
+  - Screenshot of Network Metrics Section - ![GCP App Engine Network Metrics Section Screenshot](assets/network-metrics-section.png)
+