Add services to add/remove device trackers from persons

[frenck]

Description

Adds services to modify persons in Home Assistant, allowing to add/remove devices trackers from them on the fly.

Motivation and Context

As requested in: #325

It would, for example, allow temporarily attaching a device tracker (for example, a car tracker) to a person while they are traveling.

How has this been tested?

Using the dev tools

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[sonarqubecloud]

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33.5% Duplication