[hostmetricsreceiver]: support reporting amount of available logical and physical CPUs

[frzifus]

Description:

Link to tracking Issue:

• [processor/resourcedetection, receiver/hostmetrics] Report total memory and CPU capacity numbers as resource attributes #22099

Testing:
Manually:

---
receivers:
  hostmetrics:
    collection_interval: 30s
    scrapers:
      cpu:
        metrics:
          system.cpu.time:
            enabled: false
          system.cpu.utilization:
            enabled: false
          system.cpu.count:
            enabled: true

exporters:
  logging:
    verbosity: detailed
  prometheus:
    endpoint: "127.0.0.1:9090"

service:
  pipelines:
    metrics:
      receivers: [hostmetrics]
      exporters: [logging, prometheus]

Got:

Resource SchemaURL: https://opentelemetry.io/schemas/1.9.0
ScopeMetrics #0
ScopeMetrics SchemaURL: 
InstrumentationScope otelcol/hostmetricsreceiver/cpu 0.79.0-dev
Metric #0
Descriptor:
     -> Name: system.cpu.count
     -> Description: Number of available CPUs.
     -> Unit: 1
     -> DataType: Gauge
NumberDataPoints #0
Data point attributes:
     -> machine-id: Str(1819479dc7174971967d4f2f1ba7b794)
StartTimestamp: 2023-06-08 13:40:33 +0000 UTC
Timestamp: 2023-06-08 14:11:56.118141589 +0000 UTC
Value: 8
	{"kind": "exporter", "data_type": "metrics", "name": "logging"}


---


# HELP system_cpu_count_ratio Nnumber of available CPUs.
# TYPE system_cpu_count_ratio gauge
system_cpu_count_ratio{machine_id="1819479dc7174971967d4f2f1ba7b794"} 8

Documentation:

documentation.md was automatically updated by mdatagen.

[dmitryax]

I'd be great if you can submit a PR to https://github.com/open-telemetry/semantic-conventions/blob/4456e4d1d4c2858ffd495a5cc6dc02f802dbaec4/specification/metrics/semantic_conventions/system-metrics.md#systemcpu---processor-metrics as well

[mx-psi]

Blocked by open-telemetry/semantic-conventions#99

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.

[frzifus]

I assume we can pickup this again. Since the open-telemetry/semantic-conventions#99 got merged.

cc @mx-psi

[mx-psi]

LGTM, needs a rebase