feat(omemo): add signal protocol wrappers

qomemo/signal/stores/store_context.h

@@ -0,0 +1,24 @@
+/*
+ * Created by victoria on 2021-05-13.
+ */
+
+#pragma once
+
+#include <signal/signal_protocol.h>
+
+namespace Signal::Store {
+
+    class Context {
+    public:
+        explicit Context(signal_context *global);
+        ~Context();
+
+        Context(const Context &) = delete;
+        Context(Context &&) = delete;
+        Context &operator=(const Context &) = delete;
+
+    private:
+        signal_protocol_store_context *ctx{nullptr};
+    };
+
+} // namespace Signal::Store