feat(tailscale): new tailscale plugin (#12523)

plugins/tailscale/README.md

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+# tailscale
+
+This plugin provides completion for [tailscale](https://tailscale.com/) (Easy software-defined networks using an implementation of wireguard).
+
+To use it, add `tailscale` to the plugins array in your zshrc file.
+
+```
+plugins=(... tailscale)
+```
+
+**Author:** [@lukeab](https://github.com/lukeab)

plugins/tailscale/tailscale.plugin.zsh

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+
+if [ $commands[tailscale] ]; then
+  source <(tailscale completion zsh)
+fi