Add AddressToUintMap (#3150)

* add AddressToUintMap

* Update contracts/utils/structs/EnumerableMap.sol

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>

* address comments

* lint code

* merge mocks into a single file

* add PR link to changelog entry

Co-authored-by: Francisco Giordano <frangio.1@gmail.com>
Co-authored-by: Hadrien Croubois <hadrien.croubois@gmail.com>

test/utils/structs/EnumerableMap/helpers.js

@@ -0,0 +1,31 @@
+const zip = require('lodash.zip');
+
+const toStringArray = (array) => array.map((i) => i.toString());
+
+async function expectMembersMatch (map, keys, values) {
+  const stringKeys = toStringArray(keys);
+  const stringValues = toStringArray(values);
+
+  expect(keys.length).to.equal(values.length);
+
+  await Promise.all(keys.map(async (key) => expect(await map.contains(key)).to.equal(true)));
+
+  expect(await map.length()).to.bignumber.equal(keys.length.toString());
+
+  expect(toStringArray(await Promise.all(keys.map((key) => map.get(key))))).to.have.same.members(stringValues);
+
+  // to compare key-value pairs, we zip keys and values
+  // we also stringify pairs because this helper is used for multiple types of maps
+  expect(
+    await Promise.all(
+      [...Array(keys.length).keys()].map(async (index) => {
+        const { key, value } = await map.at(index);
+        return [key.toString(), value.toString()];
+      }),
+    ),
+  ).to.have.same.deep.members(zip(stringKeys, stringValues));
+}
+
+module.exports = {
+  expectMembersMatch,
+};