feat: add ERC7572 interface for contracts that expose contract level metadata

.changeset/fluffy-bananas-add.md

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+---
+'openzeppelin-solidity': patch
+---
+
+`IERC7572`: Add interface to support contract-level metadata.

contracts/interfaces/draft-IERC7572.sol

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+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (last updated v5.3.0) (interfaces/draft-IERC7572.sol)
+
+pragma solidity ^0.8.20;
+
+/// @title ERC-7572 Contract Level Metadata
+/// @dev Required interface of an ERC-7572 compliant contract, as defined in the
+/// https://eips.ethereum.org/EIPS/eip-7572[ERC].
+interface IERC7572 {
+    /// @dev This event should be emitted on updates to the contract metadata
+    /// to indicate to offchain indexers that they should query the contract
+    /// for the latest URI.
+    event ContractURIUpdated();
+
+    /// @dev Returns an offchain resource for contract metadata or onchain JSON
+    /// data string (data:application/json;utf8,{}).
+    function contractURI() external view returns (string memory);
+}