FindMyiPhone : reduce battery usage

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Breaking changes

• FindMyiPhoneServiceManager --> FindMyiPhoneService
• find my iPhone devices fetch is now manual --> you have to call FindMyiPhoneService.refresh_client() to update devices
• find my iPhone devices does not include family devices by default, you have to with_family=False at your PyiCloudService init.
• FindMyiPhoneService will return the service, not devices
• AppleDevice.status function is renamed by attrs

Changes

• we do not fetch every time we get a device status or location

Not changes

• PyiCloudService.devices will keep to same behavior ⚠️ WILL DO I/O and request all your devices
• PyiCloudService.iphone will keep to same behavior ⚠️ WILL DO I/O and request all your devices

Additions

• get the Find my iPhone service with PyiCloudService.find_my_iphone, no devices will be fetched
• you can set the with_family boolean param to True to the PyiCloudService to get your family devices fetches.
• do find_my_iphone_service.refresh_client() to fetch and update devices
• Apple device attrs are available as properties

[Quentame]

Also update read_me