Adds new integration [BJReplay/ha-solcast-solar]

[BJReplay]

Checklist

• I've read the publishing documentation.
• I've added the HACS action to my repository.
• (For integrations only) I've added the hassfest action to my repository.
• The actions are passing without any disabled checks in my repository.
• I've added a link to the action run on my repository below in the links section.
• I've created a new release of the repository after the validation actions were run successfully.

Links

Link to current release: https://github.com/BJReplay/ha-solcast-solar/releases/tag/v4.2.7
Link to release HACS action: https://github.com/BJReplay/ha-solcast-solar/actions/runs/12113892748
Link to release hassfest action: https://github.com/BJReplay/ha-solcast-solar/actions/runs/12113892757

This is a replacement for the integration mentioned in hacs/integration#3745 that has been deleted by the original author.

[albertusQuelle]

changes okay

[svisagie]

All good

[EduardTheThird]

I approve of these changes.

[chronvas]

Hello @ludeeus 👋 can this be added? Thanks

[BJReplay]

Hello @ludeeus 👋 can this be added? Thanks

Please don't nag the repo owner. As author of this PR, I am happy to wait.