add utils and constants

src/openzeppelin/lib.cairo

@@ -1,3 +1,4 @@
 mod security;
 mod token;
 mod tests;
+mod utils;

src/openzeppelin/utils.cairo

@@ -0,0 +1 @@
+mod constants;

src/openzeppelin/utils/constants.cairo

@@ -0,0 +1,32 @@
+//
+// Interface ids
+//
+
+// ERC165
+const IERC165_ID: u32 = 0x01ffc9a7_u32;
+const INVALID_ID: u32 = 0xffffffff_u32;
+
+// Account
+const IACCOUNT_ID: u32 = 0xa66bd575_u32;
+
+// ERC721
+const IERC721_ID: u32 = 0x80ac58cd_u32;
+const IERC721_RECEIVER_ID: u32 = 0x150b7a02_u32;
+const IERC721_METADATA_ID: u32 = 0x5b5e139f_u32;
+const IERC721_ENUMERABLE_ID: u32 = 0x780e9d63_u32;
+
+// ERC1155
+const IERC1155_ID: u32 = 0xd9b67a26_u32;
+const IERC1155_METADATA_ID: u32 = 0x0e89341c_u32;
+const IERC1155_RECEIVER_ID: u32 = 0x4e2312e0_u32;
+const ON_ERC1155_RECEIVED_SELECTOR: u32 = 0xf23a6e61_u32;
+const ON_ERC1155_BATCH_RECEIVED_SELECTOR: u32 = 0xbc197c81_u32;
+
+// AccessControl
+const IACCESSCONTROL_ID: u32 = 0x7965db0b_u32;
+
+//
+// Roles
+//
+
+const DEFAULT_ADMIN_ROLE: felt252 = 0x00;