Change attributes output format

[KrzysztofHajdamowicz]

Is your feature request related to a problem? Please describe.
EV Smart Charging provides rough charging start/charging stop attributes when to charge car.
It's output format is barely suitable for Apex Charts overlay showing when car will charge

Describe the solution you'd like
Attribute showing data in same structure as jinja macro:

"hours": [
  {
    "start": "2024-08-27T23:00:00+02:00",
    "end": "2024-08-28T00:00:00+02:00",
    "hours": 1,
    "prices": [
      0.47819,
      [...]
      0.47819
    ],
    "is_now": false
  },
  {
    "start": "2024-08-28T01:00:00+02:00",
    "end": "2024-08-28T04:00:00+02:00",
    "hours": 3,
    "prices": [
      0.48061,
      0.48061,
      [...]
      0.48071
    ],
    "is_now": false
  },
  [...]
]

Additional context
My goal is to draw list of hours when car will charge, not whole span of hours.
For example, if car is scheduled to charge between 23:00-00:00, 02-03:00 I want to see two separate candles on chart, not single block 23:00-03:00.
Gridio App shows data in simmilar way

[ksga]

Default Apex Chart configuration (found in README) does just that: