[FR] Add random color to each entity

[AleXSR700]

Is your feature request related to a problem? Please describe.
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
It is more of a visual optimization than a problem, but it would be nice if there was a config setting that would add random colors to each entity. Ideally for parents and children and only if no manual color is defined.

Describe the solution you'd like
A clear and concise description of what you want to happen.
Add config setting like color_random: true that automatically assigns each entity (that has no defined color: property) a random color.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

I wrote myself a short jinja template that does this for me, but since the random function updates every few seconds, it is a bit of a pain to copy and of course: it is far less elegant than having a built in feature :)

{% set sensors = states.sensor | selectattr('entity_id', 'search', 'energy_today') %}
  {% set filtered_sensors = sensors | selectattr('entity_id', 'search', 'energy_today(_\d+)?$') %}
  {% if filtered_sensors %}
{% for sensor in filtered_sensors %}
{{ "- type: entity" }}
  {{ "children: []" }}
  {{ "entity_id: " + sensor.entity_id }}{% set random_color = "rgb(" ~ range(0, 256) | random ~ "," ~ range(0, 256) | random ~ "," ~ range(0, 256) | random ~ ")" %}
  {{ "color: " + random_color }}{% endfor %}
{% endif %}

Additional context
Add any other context or screenshots about the feature request here.