feat: bus response to check for HA connection

[mikejgray]

Linked to the skill branch FEAT_DisableIntentsWhenUnavailable
mikejgray/neon-homeassistant-skill#27

[NeonDaniel]

Validated

(venv) neon@neon:~$ mana send-message ovos.phal.plugin.homeassistant.check_connected -r
{'context': {},
 'data': {'connected': False},
 'type': 'ovos.phal.plugin.homeassistant.check_connected.response'}
(venv) neon@neon:~$ mana send-message ovos.phal.plugin.homeassistant.check_connected -r
{'context': {},
 'data': {'connected': True},
 'type': 'ovos.phal.plugin.homeassistant.check_connected.response'}