Input helper support in Client

[helto4real]

Breaking change

Proposed change

This is the first PR of several that will add support to create, delete and list Helpers from HA.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• 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 #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the [development checklist][dev-checklist]
• The code compiles without warnings (code quality chek)
• Tests have been added to verify that the new code works.

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

• Documentation added/updated for www.home-assistant.io

[codecov-commenter]

Codecov Report

Base: 80.85% // Head: 80.85% // No change to project coverage 👍

Coverage data is based on head (bd47e36) compared to base (172aa61).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head bd47e36 differs from pull request most recent head 5dc49a8. Consider uploading reports for the commit 5dc49a8 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #831   +/-   ##
=======================================
  Coverage   80.85%   80.85%           
=======================================
  Files         159      159           
  Lines        4096     4096           
  Branches      405      405           
=======================================
  Hits         3312     3312           
  Misses        621      621           
  Partials      163      163           

Flag	Coverage Δ
unittests	80.85% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...nsions/HomeAssistantConnectionHelpersExtensions.cs	100.00% <ø> (ø)
...istant/Commands/CreateInputBooleanHelperCommand.cs	100.00% <ø> (ø)
...t/Common/HomeAssistant/Model/InputBooleanHelper.cs	66.66% <100.00%> (ø)

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