Add config flow to iCloud

[Quentame]

Breaking Change:

The iCloud component leaves the device_tracker platform to become an integration.

From:

device_tracker:
  - platform: icloud
    username: __email__
    password: __password__

To:

icloud:
  - username: __email__
    password: __password__

Here are all the services :
SERVICE_ICLOUD_PLAY_SOUND = "play_sound"
SERVICE_ICLOUD_DISPLAY_MESSAGE = "display_message"
SERVICE_ICLOUD_LOST_DEVICE = "lost_device"
SERVICE_ICLOUD_UPDATE = "update"

Some services are renamed :
'icloud_lost_device' --> 'lost_device'
'icloud_update' --> 'update'

'icloud_reset' is removed

The iCloud cookie folder moved from [HA_dir]/icloud to [HA_dir]/.storage/icloud.

Description:

Dramatically improve the iCloud integration addition UX with config flow, translated steps (will do),
and list selection while choosing the trusted device (instead of a number).

It also adds documentation to services, and will fix issues.

Following the draft PR #24053 and crowded PR #26590

PR doing :

• add config flow + tests
• fix existing services
• add play_sound & display_message services
• document services
• can use devices with the same name
• prepare to add sensor platform (battery for devices)

Related issue (if applicable):
fixes #13312
fixes #20195
fixes #28826

Pull request with documentation for home-assistant.io : home-assistant/home-assistant.io#11259

Example entry for configuration.yaml (if applicable):

icloud:
  - username: __email__
    password: __password__

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated in home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly. Update and include derived files by running python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt by running python3 -m script.gen_requirements_all.
• Untested files have been added to .coveragerc.

[Quentame]

I've updated the description to follow the added breaking changes : the location of the iCloud cookie folder + the deletion of the reset service

[MartinHjelmare]

Do the tests need updating to not do I/O?

[Quentame]

@MartinHjelmare : Yep, I'm working on it right now. Hope to make it work for 0.103.0 😄

[Quentame]

If you wanna help, I have this for now :

[MartinHjelmare]

Why not patch the service class as we talked about above?

[Quentame]

Ok, just working in my computer, pushing

[Quentame]

@MartinHjelmare : What do you think of e2d040e ?

[Quentame]

What is the state of the PR now ?

[MartinHjelmare]

There seems to be one line in the config flow that isn't covered by tests:
https://codecov.io/gh/home-assistant/home-assistant/compare/27530be46fd7550edba2b1725ea6b790b74328cc...fc020539714d60c5a57c64c9ba0a2f6d33da6acd/diff#D4-213

[Quentame]

Got the 100% code coverage 😉

[MartinHjelmare]

Looks good!