hyprpm: Add support for specifying exact git revisions for plugin repo (#4983)

* hyprpm(feat): support specifying exact git revs

* Mention git rev argument in help

* Mention git rev arg is optional

* Wrap text

hyprpm/src/core/Plugin.hpp

@@ -12,6 +12,7 @@ struct SPlugin {
 
 struct SPluginRepository {
     std::string          url;
+    std::string          rev;
     std::string          name;
     std::vector<SPlugin> plugins;
     std::string          hash;