Lua: Add access for plugin application data path

Change-Id: Ib5f60818b8b2590d3a5d09a7900110956f98b4cf
Reviewed-by: Marcus Tillmanns <marcus.tillmanns@qt.io>

src/plugins/lua/luaengine.cpp

@@ -72,7 +72,9 @@ QObject *ScriptPluginSpec::setup(
         "name",
         sol::property([](ScriptPluginSpec &self) { return self.name; }),
         "pluginDirectory",
-        sol::property([pluginLocation]() { return pluginLocation; }));
+        sol::property([pluginLocation]() { return pluginLocation; }),
+        "appDataPath",
+        sol::property([appDataPath]() { return appDataPath; }));
 
     auto guardObject = std::make_unique<QObject>();
     auto guardObjectPtr = guardObject.get();

src/plugins/lua/meta/qtc.lua

@@ -3,6 +3,7 @@
 ---@class PluginSpec
 ---@field name string The name of the plugin.
 ---@field pluginDirectory FilePath The directory of the plugin.
+---@field appDataPath FilePath The application data directory of the plugin.
 PluginSpec = {}
 ---The global qtc object defined in the Lua plugin.
 ---@class qtc