feat(gameplay): add ocean wave ambient sounds with random selection

Add four ocean wave FLAC sound files and play one randomly when player is within 10 blocks of sea level and in an ocean biome. Include a Random member initialized from ChunkGenerator seed for consistent randomization.

include/Cubed/gameplay/client_world.hpp

@@ -6,6 +6,7 @@
 #include "Cubed/gameplay/client_player.hpp"
 #include "Cubed/gameplay/game_time.hpp"
 #include "Cubed/gameplay/network_client.hpp"
+#include "Cubed/tools/cubed_random.hpp"
 #include "Cubed/tools/priority_thread_pool.hpp"
 
 #include <absl/container/flat_hash_set.h>
@@ -153,6 +154,8 @@ private:
 
     std::atomic<std::shared_ptr<PriorityThreadPool>> m_thread_pool;
 
+    Random m_random;
+
     void client_run(std::stop_token token);
 
     void report_player_info();