home-assistant: Add support for Yoto custom component

[seberm]

This PR adds support for Yoto Home-Assistant custom component:

• yoto_ha: https://github.com/cdnninja/yoto_ha
• yoto_api: https://github.com/cdnninja/yoto_api

Things done

• Added python3 package yoto-api which is needed for yoto-ha custom component.
• Added and tested the custom Yoto component in my local HA instance.

Tested in my local HA configuration in the following way:

customComponents = with pkgs-unstable; [
  (callPackage ../hass/custom-components/yoto_ha/package.nix {
    yoto-api = (python3Packages.callPackage ../hass/pkgs/yoto-api.nix {});
  })
];

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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