Add datetime platform for supported broadlink devices

[eifinger]

Proposed change

The Broadlink thermostat devices have a large time drift of up to several minutes per week. This platform allows to sync time to the device.

Especially after DST changes this saves users from having to walk to each device and click buttons.

As an example this can also be run with an automation every night.

Type of change

• Spelling, grammar or other readability improvements (current branch).
• Adjusted missing or incorrect information in the current documentation (current branch).
• Added documentation for a new integration I'm adding to Home Assistant (next branch).
  • I've opened up a PR to add logos and icons in Brands repository.
• Added documentation for a new feature I'm adding to Home Assistant (next branch).
• Removed stale or deprecated documentation.

Additional information

• Link to parent pull request in the codebase: Add datetime platform for supported broadlink devices core#115408
• Link to parent pull request in the Brands repository:
• This PR fixes or closes issue: fixes #

Checklist

• This PR uses the correct branch, based on one of the following:
  • I made a change to the existing documentation and used the current branch.
  • I made a change that is related to an upcoming version of Home Assistant and used the next branch.
• The documentation follows the Home Assistant documentation standards.

[home-assistant]

It seems that this PR is targeted against an incorrect branch since it has a parent PR on one of our codebases. Documentation that needs to be updated for an upcoming release should target the next branch. Please change the target branch of this PR to next and rebase if needed.

[netlify]

✅ Deploy Preview for home-assistant-docs ready!

Name	Link
🔨 Latest commit	c9fad37
🔍 Latest deploy log	https://app.netlify.com/sites/home-assistant-docs/deploys/6641b8ce552d970008eb80b0
😎 Deploy Preview	https://deploy-preview-32712--home-assistant-docs.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[c0ffeeca7]

LGTM, @eifinger 👍