Adds new integration [timniklas/hass-fitx]

[timniklas]

Checklist

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

Links

Link to current release: https://github.com/timniklas/hass-fitx/releases/tag/v1.0.1 Link to successful HACS action (without the ignore key): https://github.com/timniklas/hass-fitx/actions/runs/11392543715/job/31698851837 Link to successful hassfest action (if integration): https://github.com/timniklas/hass-fitx/actions/runs/11392543699/job/31698851862