New Service Widget - WatchYourLAN

[danlindow]

Proposed change

This MR adds support for the WatchYourLAN service. Specifically it renders two counters which represent the known and unknown hosts on a given LAN.

Example Screenshot:

This is a single API operation to the /api/all endpoint and counts the number of known/unknown hosts on the LAN.

There is some interest for this widget as seen here:
#1767
myself included :)

Type of change

• New service widget
• Bug fix (non-breaking change which fixes an issue)
• New feature or enhancement (non-breaking change which adds functionality)
• Documentation only
• Other (please explain)

Checklist:

• If applicable, I have added corresponding documentation changes.
• If applicable, I have reviewed the feature / enhancement and / or service widget guidelines.
• I have checked that all code style checks pass using pre-commit hooks and linting checks.
• If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.

[shamoon]

Naively, I thought that these changes to the PR template would help. Unfortunately not. Still I will show them again so as to emphasize:

Before opening this pull request please review the guidelines in the
checklist below.
If this PR does not meet those guidelines it will not be accepted, and everyone will be sad.