Add reboot_gateway service to Velux

[pawlizio]

Proposed change

Provides a workaround for #34844 by adding a reboot service for the KLF200 gateway which can be integrated in automations. Most likely:

alias: KLF reboot on hass stop event
description: ''
trigger:
  - event_data: {}
    event_type: homeassistant_stop
    platform: event
condition: []
action:
  - data: {}
    service: velux.reboot_gateway
mode: single

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue: SSL handshake error in Velux component #34844
• Link to documentation pull request: Add velux reboot service home-assistant.io#16352

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• The code has been formatted using Black (black --fast homeassistant tests)
• Tests have been added to verify that the new code works.

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

• Documentation added/updated for www.home-assistant.io

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

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

The integration reached or maintains the following Integration Quality Scale:

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To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.

[probot-home-assistant]

Hey there @Julius2342, mind taking a look at this pull request as its been labeled with an integration (velux) you are listed as a codeowner for? Thanks!
_{^{(message by CodeOwnersMention)}}

[Julius2342]

Yes, this is a useful improvement to work around KLF200 difficulties.

And it looks sane. (Im not much into the hass codebase at the moment).

[mtdcr]

Exposes a newly added feature of pyvlx as a service. Useful, because the KLF200 has a tendency to stop accepting new connections after some time.

This was split out of #42773 to reduce complexity.

[Julius2342]

Hi home-assistant team, is there anything which blocks merging this PR?

[frenck]

Not stale, awaiting our review.

[frenck]

Yeah this is fine ✅

However, it needs a documentation update to list this service. Please open a PR on our documentation and link it with this PR.

[pawlizio]

@frenck I created a PR for documentation: https://github.com/home-assistant/home-assistant.io/pull/16352

[frenck]

Thanks, @pawlizio 👍