History graph card: allow color customization for "line" graphs

[ildar170975]

Breaking change

Proposed change

Currently the only way to customize colors in history-graph (particularly – for linear state-history-chart-line) – defining --graph-color variables in a custom theme.
But this way has limitations:
-- cannot customize colors only for a particular card (unless card-mod is used);
-- cannot customize a color for a particular entity, a color depends on an index.
There were many requests in Community for adding a possibility to define colors in the history-graph config directly.

Related:
#18494
https://community.home-assistant.io/t/changing-colors-of-the-history-graph/219535
#11054
#11188
https://github.com/orgs/home-assistant/discussions/168

This PR contains:

1. Support of color option in history-graph card.
2. A corresponding color input field added in UI editor.
3. The mentioned color input field is disabled for assumingly not-numerical entities. Means – colors can be only defined for assumingly numerical entities: for counter/input_number/number domains, for sensors with defined unit_of_measurement & state_class attributes, but sensorNumericDeviceClasses is not accounted for simplicity. Anyway, if a user defines the color option for a timeline graph – this option will not be accounted as meaningless. Similarly, the color option cannot be defined for climate & water_heater entities due to a complex presentation, a default colors generation is used.
4. The added color option is optional. If it is not defined for some entity – a default color generation is used for this entity.
5. Options of the history-graph card are automatically placed in yaml in a correct consistent order.
6. There are few formats can be used to define a color option in yaml: lightgreen (web color), light-green (HA theme color transformed into --light-green-color CSS var and then resolved from a current theme), #ff00ff (hex), rgb(0,0,255) (RGB). Note that a red color will be processed as a --red-color variable (a value may differ from a red web color).
7. Colors are respected for statistics “augmented” parts.

Similar - for Statistics graph card: #51824

Docs are updated - home-assistant/home-assistant.io#45123.

UI editor (layout can be changed due to #51749):

Default & customized colors:

Different color formats used in yaml:

History + statistics:

Disabled color option:

Screenshots

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• 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 or discussion: Logarithmic scale and color options directly on the charts page #18494, https://community.home-assistant.io/t/changing-colors-of-the-history-graph/219535, Colors of charts (history and statistics): watch out for the colorblind #11054, Ability to set History Graph colors #11188, https://github.com/orgs/home-assistant/discussions/168
• Link to documentation pull request: History graph card: add custom color support home-assistant.io#45123
• Link to developer documentation pull request:
• Link to backend pull request:

Checklist

• I understand the code I am submitting and can explain how it works.
• The code change is tested and works locally.
• There is no commented out code in this PR.
• I have followed the perfect PR recommendations
• Any generated code has been carefully reviewed for correctness and compliance with project standards.

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

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

To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.