feat: Tailscale ping monitor (#3178)

* Add boilerplate for tailscale ping

* tailscale initial commit draft

* Refactor TailscalePing & better error handling

Split check function into two methods and added async/await syntax for readability/modularity
Switched to promise-based error handling (takes into account different types of error such as "Execution error", "Error in output", "no matching peer", and "is local Tailscale IP") and throws them as JavaScript errors.

* Minor update

* minor update (again)

* Update server/monitor-types/tailscale-ping.js

Co-authored-by: Frank Elsinga <frank@elsinga.de>

* Update server/monitor-types/tailscale-ping.js

Co-authored-by: Frank Elsinga <frank@elsinga.de>

* Update server/monitor-types/tailscale-ping.js

Co-authored-by: Frank Elsinga <frank@elsinga.de>

* Update server/monitor-types/tailscale-ping.js

Co-authored-by: Frank Elsinga <frank@elsinga.de>

* timeout revision

* JSDoc

* Removed long explainers

* eslint tailscale-ping.js --fix

* reran eslint

* Fix: Use hostname rather than url

* Fixed NaN on monitor interval

now interval value is correctly passed to runTailscalePing

* Add warning message

---------

Co-authored-by: Louis Lam <louislam@users.noreply.github.com>
Co-authored-by: Frank Elsinga <frank@elsinga.de>

src/lang/en.json

@@ -364,6 +364,7 @@
     "deleteDockerHostMsg": "Are you sure want to delete this docker host for all monitors?",
     "socket": "Socket",
     "tcp": "TCP / HTTP",
+    "tailscalePingWarning": "In order to use the Tailscale Ping monitor, you need to install Uptime Kuma without Docker and also install Tailscale client on your server.",
     "Docker Container": "Docker Container",
     "Container Name / ID": "Container Name / ID",
     "Docker Host": "Docker Host",