Add comprehensive codec management functionality

Author: sumanjeet0012

multicodec/__init__.py

@@ -4,13 +4,32 @@
 __email__ = "dhruv@dhruvb.com"
 __version__ = "0.2.1"
 
+# Core Code type
+from .code import (
+    RESERVED_END,
+    RESERVED_START,
+    Code,
+    is_reserved,
+    known_codes,
+)
+
+# Original multicodec functions
 from .multicodec import add_prefix, extract_prefix, get_codec, get_prefix, is_codec, remove_prefix
 
 __all__ = [
+    "RESERVED_END",
+    # Constants
+    "RESERVED_START",
+    # Code type
+    "Code",
+    # Original functions
     "add_prefix",
     "extract_prefix",
     "get_codec",
     "get_prefix",
     "is_codec",
+    "is_reserved",
+    # Functions
+    "known_codes",
     "remove_prefix",
 ]