Octopus Fan Club support

[BottlecapDave]

Discussed in #538

^{Originally posted by h4rryb November 17, 2023}
I've just installed this - great set of tools to use on HA! I wondered if there is a way to get the current estimated % saving on the electricity unit rate from the Octopus Fan Club in a similar manner to how it shows in the Octopus dashboard (if that info is accessible via the APIs?)

https://www.octopusenergygeneration.com/fan-club/

See original discussion for plan of action, along with some API examples.

[HITESHLAD1985]

Yep this would be very useful for me to schedule charging of the battery. If we could have the future prediction information at the bottom of the page as well that would be great.

[BenGlossop09]

Fellow Fan #1 member here! I would love to see this implemented within the integration.