feat(slock): implement ext_session_lock_v1 backend

note: did not run lints or fully test yet

src/wayland/session_lock/lock.cpp

@@ -0,0 +1,42 @@
+#include "lock.hpp"
+
+#include <private/qwaylandshellintegration_p.h>
+#include <qtmetamacros.h>
+
+#include "manager.hpp"
+
+QSWaylandSessionLock::QSWaylandSessionLock(
+    QSWaylandSessionLockManager* manager,
+    ::ext_session_lock_v1* lock
+)
+    : manager(manager) {
+	this->init(lock); // if isInitialized is false that means we already unlocked.
+}
+
+QSWaylandSessionLock::~QSWaylandSessionLock() { this->unlock(); }
+
+void QSWaylandSessionLock::unlock() {
+	if (this->isInitialized()) {
+		if (this->locked) this->unlock_and_destroy();
+		else this->destroy();
+
+		this->locked = false;
+		this->manager->active = nullptr;
+
+		emit this->unlocked();
+	}
+}
+
+bool QSWaylandSessionLock::active() const { return this->isInitialized(); }
+
+bool QSWaylandSessionLock::hasCompositorLock() const { return this->locked; }
+
+void QSWaylandSessionLock::ext_session_lock_v1_locked() {
+	this->locked = true;
+	emit this->compositorLocked();
+}
+
+void QSWaylandSessionLock::ext_session_lock_v1_finished() {
+	this->locked = false;
+	this->unlock();
+}