style/ci: apply clang-format and verify it in ci (#4039)

* style: apply clang-format

* ci: add new clang-format job to CI

src/Window.hpp

@@ -11,16 +11,14 @@
 #include "macros.hpp"
 #include "managers/XWaylandManager.hpp"
 
-enum eIdleInhibitMode
-{
+enum eIdleInhibitMode {
     IDLEINHIBIT_NONE = 0,
     IDLEINHIBIT_ALWAYS,
     IDLEINHIBIT_FULLSCREEN,
     IDLEINHIBIT_FOCUS
 };
 
-enum eGroupRules
-{
+enum eGroupRules {
     // effective only during first map, except for _ALWAYS variant
     GROUP_NONE        = 0,
     GROUP_SET         = 1 << 0, // Open as new group or add to focused group