Add ERC1155URIStorage (#3210)

* Add ERC721URIStorage-like extension for ERC1155

* Add tests for ERC1155URIStorage extension

* add changelog entry for ERC721URIStorage

* Fix linting errors

* Emit URI event in ERC1155URIStorage

* Remove exists check and ERC1155Supply dependency

* Fix lint error

* Overwrite ERC1155 uri method

* Update ERC1155URIStorage specs

* Fix ERC1155URIStorageMock

* Rename _setTokenURI => _setURI in ERC1155URIStorage

* Add baseURI to ERC1155URIStorage

* Move super.uri call in ERC1155URIStorage

* Clearify ERC1155URIStorage description in change log

* reorder changelog & add documentation

* improve documentation

* fix typo

Co-authored-by: Hadrien Croubois <hadrien.croubois@gmail.com>

contracts/mocks/ERC1155URIStorageMock.sol

@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.0;
+
+import "./ERC1155Mock.sol";
+import "../token/ERC1155/extensions/ERC1155URIStorage.sol";
+
+contract ERC1155URIStorageMock is ERC1155Mock, ERC1155URIStorage {
+    constructor(string memory _uri) ERC1155Mock(_uri) {}
+
+    function uri(uint256 tokenId) public view virtual override(ERC1155, ERC1155URIStorage) returns (string memory) {
+        return ERC1155URIStorage.uri(tokenId);
+    }
+
+    function setURI(uint256 tokenId, string memory _tokenURI) public {
+        _setURI(tokenId, _tokenURI);
+    }
+
+    function setBaseURI(string memory baseURI) public {
+        _setBaseURI(baseURI);
+    }
+}