Allow customizing display name for energy device

[karwosts]

Proposed change

Allow for storing a custom display name with individual device consumptions for energy dashboard. This allows users for a cleaner and less cluttered dashboard, as entity ids for energy devices often have terms like "Energy", "Consumption", "Daily", "Weekly", "Total", etc which are not relevant for the energy dashboard, but may still be wanted as part of the entity name when looking at it out of the context of energy dashboard.

Also space is at a premium for smaller/mobile devices, and the visual display can be improved with shorter names to minimize space consumption of the legend.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• 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:
  https://community.home-assistant.io/t/energy-custom-names-for-individual-devices/372943
  https://community.home-assistant.io/t/wth-can-t-i-change-name-on-energy-dashboard-monitor-individual-devices/472496
  https://community.home-assistant.io/t/to-have-the-ability-to-rename-in-energy-dashboard/503823
  https://community.home-assistant.io/t/rename-energys-individual-devices/378360
  https://community.home-assistant.io/t/wth-cant-i-still-not-change-source-names-for-energy-dashboard/470467
  Friendly Name Energy Dashboard frontend#20024
  add max_devices and name: option to Energy panel frontend#19983
  Support renaming of "sources" shown in the Energy dashboard frontend#18215
  https://community.home-assistant.io/t/detail-devices-energy-card-entity-friendly-name-labels/700475

• Link to documentation pull request:

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[home-assistant]

Hey there @home-assistant/core, mind taking a look at this pull request as it has been labeled with an integration (energy) you are listed as a code owner for? Thanks!

Code owner commands

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[karwosts]

Frontend: home-assistant/frontend#20033

[jpbede]

LGTM, thanks @karwosts ❤️