add attribute for logo and cover image

[ov3rk1ll]

This PR adds a new attribute for the logo and cover image shown in the app.

This could be used in a custom:auto-entities template to set the image field on a custom:multiple-entity-row entry

[tjorim]

Thanks for your contribution! If you have an example of how you use it, feel free to add it as well.

[ov3rk1ll]

This can be used by adding 'image': state_attr(entity_id, 'logo_url') to the README example like so

type: custom:auto-entities
card:
  type: entities
  title: TGTG Surprise Bags
filter:
  template: |-
    {% for state in states.sensor if 'sensor.tgtg_' in state.entity_id %}
      {% set entity_id = state.entity_id %}
      {% set state = states(entity_id) %}
      {%- if is_number(state) and state | int > 0 %}
        {% set pickup_start = state_attr(entity_id, 'pickup_start') %}
        {%- if pickup_start is not none -%}
          {{
            {
              'entity': entity_id,
              'name': state_attr(entity_id, 'friendly_name')[5:],
              'type': "custom:multiple-entity-row",
              'unit': false,
              'secondary_info': as_timestamp(pickup_start) | timestamp_custom('Pickup on %d-%m between %H:%M and ', true) + as_timestamp(state_attr(entity_id, 'pickup_end')) | timestamp_custom('%H:%M, € ', true) + state_attr(entity_id, 'item_price')[:-3],
              'image': state_attr(entity_id, 'logo_url'),
              'tap_action': {
                'action': 'url',
                'url_path': state_attr(entity_id, 'item_url')
              }
            }
          }},
        {%- endif -%}
      {%- endif -%}
    {%- endfor %}

which will look like this