Add device class support for Ambient PWS sensors

[bachya]

Description:

Previously, the ambient component only used device classes for binary sensors. This PR adds device class support for appropriate sensors, as well.

Related issue (if applicable): N/A

Pull request with documentation for home-assistant.io (if applicable): N/A

Example entry for configuration.yaml (if applicable):

ambient_station:
  api_key: !secret ambient_api_key
  app_key: !secret ambient_app_key

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist