feat: integrates hostmetrics receiver

[danmrichards]

Description:
Integrates the contrib hostmetrics receiver.

Testing:
Tested a forked collector on AWS GameLift with the following configuration:

extensions:
  sigv4auth:
    region: ${env:REGION}

receivers:
  hostmetrics:
    collection_interval: 30s
    scrapers:
      cpu:
      memory:
      disk:
      load:
      filesystem:
      network:
      paging:
      processes:

exporters:
  prometheusremotewrite:
    endpoint: ${env:AMP_REMOTE_WRITE_ENDPOINT}
    auth:
      authenticator: sigv4auth

service:
  extensions: [sigv4auth]
  pipelines:
    metrics:
      receivers: [hostmetrics]
      exporters: [prometheusremotewrite]

Shipping metrics to Amazon Managed Prometheus:

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.