New skill: LLM integration

[rpdelaney]

Describe the solution you'd like
Mycroft can integrate with local LLMs or remote via API.

Describe alternatives you've considered

N/A

Additional context

[mikejgray]

@rpdelaney Mycroft went out of business almost a year and a half ago, but OVOS is a fork that's carrying the torch, and it does have an integration with local LLMs: https://github.com/OpenVoiceOS/skill-ovos-fallback-chatgpt

Check out the first link to get OVOS installed and then you can pip install the fallback skill and give it a try!