Add Kaiterra integration

[Michsior14]

Description:

Support for Laser Egg and Sansedge devices.

Related issue (if applicable): fixes #

Pull request with documentation for home-assistant.io (if applicable): home-assistant/home-assistant.io#10374

Example entry for configuration.yaml (if applicable):

kaiterra:
  api_key: YOUR_API_KEY
  devices:
    - device_id: YOUR_DEVICE_ID
      type: YOUR_DEVICE_TYP

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

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated in home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly. Update and include derived files by running python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt by running python3 -m script.gen_requirements_all.
• Untested files have been added to .coveragerc.

If the code does not interact with devices:

• Tests have been added to verify that the new code works.

[homeassistant]

Hi @Michsior14,

It seems you haven't yet signed a CLA. Please do so here.

Once you do that we will be able to review and accept this pull request.

Thanks!

[MartinHjelmare]

We mostly just need to tidy up dict access.

[MartinHjelmare]

Very nice!

[MartinHjelmare]

Can be merged when build passes.