feat: netwatch binary sensor

[L2jLiga]

Proposed change

Added support for tracking Netwatch as binary sensor.

Related issue #289

Type of change

• [ ] Bugfix
• [X] New feature
• [ ] Code quality improvements to existing code or addition of tests
• [ ] Documentation

Additional information

Checklist

• [X] The code change is tested and works locally.
• [X] The code has been formatted using Black.
• [ ] Tests have been added to verify that the new code works.
• [X] Documentation added/updated if required.

[tomaae]

Nice work, just few minor changes are needed to remove redundant code and inplement translations in correct way.

[L2jLiga]

Thanks for review, I've updated PR