Add basic type hints to advantage_air

[epenet]

Proposed change

Is there an appetite for additional type hints like these, even if it doesn't cover all the code?
I think it's a first step, and encourages future contributors to add more type hints.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
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Checklist

• The code change is tested and works locally.
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• Tests have been added to verify that the new code works.

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  Updated and included derived files by running: python3 -m script.hassfest.
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[probot-home-assistant]

Hey there @Bre77, mind taking a look at this pull request as it has been labeled with an integration (advantage_air) you are listed as a code owner for? Thanks!
_{^{(message by CodeOwnersMention)}}

[Bre77]

I don't have any concerns with this.

[frenck]

Thanks, @epenet 👍