Add GCP Compute Engine resource attributes for host/instance

Author: damemi

semantic_conventions/resource/cloud_provider/gcp/gce.yaml

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+groups:
+  - id: gcp.gce
+    prefix: gcp.gce
+    type: resource
+    brief: >
+      Resources used by Google Compute Engine (GCE).
+    attributes:
+      - id: instance.name
+        type: string
+        brief: >
+          The instance name of a GCE instance. This is the value
+          provided by `host.name`, the visible name of the instance in
+          the Cloud Console UI, and the prefix for the default
+          hostname of the instance as defined by the [default internal
+          DNS
+          name](https://cloud.google.com/compute/docs/internal-dns#instance-fully-qualified-domain-names).
+        examples: ['instance-1', 'my-vm-name']
+      - id: instance.hostname
+        type: string
+        brief: >
+          The hostname of a GCE instance. This is the full value of the default or [custom hostname](https://cloud.google.com/compute/docs/instances/custom-hostname-vm).
+        examples: ['my-host1234.example.com', 'sample-vm.us-west1-b.c.my-project.internal']

specification/resource/semantic_conventions/cloud_provider/gcp/gce.md

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+# Google Compute Engine
+
+**Type:** `gcp.gce`
+
+**Description:** Resource attributes for GCE instances.
+
+<!-- semconv gcp.gce -->
+| Attribute  | Type | Description  | Examples  | Requirement Level |
+|---|---|---|---|---|
+| `gcp.gce.instance.name` | string | The instance name of a GCE instance. This is the value provided by `host.name`, the visible name of the instance in the Cloud Console UI, and the prefix for the default hostname of the instance as defined by the [default internal DNS name](https://cloud.google.com/compute/docs/internal-dns#instance-fully-qualified-domain-names). | `instance-1`; `my-vm-name` | Recommended |
+| `gcp.gce.instance.hostname` | string | The hostname of a GCE instance. This is the full value of the default or [custom hostname](https://cloud.google.com/compute/docs/instances/custom-hostname-vm). | `my-host1234.example.com`; `sample-vm.us-west1-b.c.my-project.internal` | Recommended |
+<!-- endsemconv -->