feat: discovery document macro (#19)

BREAKING-CHANGE: large API rewrite

Co-authored-by: arcnmx <git@git.arcn.mx>

.vscode/launch.json

@@ -0,0 +1,26 @@
+{
+  // Use IntelliSense to learn about possible attributes.
+  // Hover to view descriptions of existing attributes.
+  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "type": "lldb",
+      "request": "launch",
+      "name": "Debug unit tests in library 'hass-mqtt-discovery-macros'",
+      "cargo": {
+        "args": [
+          "test",
+          "--no-run",
+          "--lib",
+          "--package=hass-mqtt-discovery-macros"
+        ],
+        "filter": {
+          // "name": "hass_mqtt_discovery_macros"
+        }
+      },
+      "args": [],
+      "cwd": "${workspaceFolder}"
+    }
+  ]
+}