Implementing registered files in io_uring

The windows implementation is disabled, currently registering files in
IO Ring when there is inflight IO operations causes corruptions.

Implementing a config file.

Some code cleanup

config.h

@@ -0,0 +1,27 @@
+
+#define FILE_HASHES_TXT "file_hashes.txt"
+#define HASH_STRLEN 33 // 128-bit hex (32 chars) + null
+#define MAX_PATHLEN 4096
+#define READ_BLOCK (KiB(64))
+
+#define MULTI_THREADED true
+
+// -------------------- IO Ring Configuration ----------------------
+#define USE_IORING 1
+
+#if USE_IORING
+#define IORING_BUFFER_SIZE (KiB(256))
+#define NUM_BUFFERS_PER_THREAD 32
+#define MAX_ACTIVE_FILES 32
+#define SUBMIT_TIMEOUT_MS 30000
+
+#define IORING_DEBUG_PRINTS false
+#define IORING_DEBUG_STATS false
+
+#if defined(_WIN32) || defined(_WIN64)
+#define USE_REGISTERED_FILES false
+#elif defined(__linux__)
+#define USE_REGISTERED_FILES true
+#endif
+
+#endif