Move search users into a dedicated service (#789)

* add users provider with test

* add ui test for search users

* add changelog

* Update ElementX/Sources/Services/Users/UsersProvider.swift

Co-authored-by: Alfonso Grillo <alfogrillo@gmail.com>

* add error handling in usersprovider

* remove empty section

* add search in invite users

* add CancellableTask, add setup App Settings in UnitTest, screenshots

* rename of UserDiscoveryService

* Update ElementX/Sources/Other/Extensions/Publisher.swift

Co-authored-by: Doug <6060466+pixlwave@users.noreply.github.com>

* new error management for User Discovery Service

* Update ElementX/Sources/Other/CancellableTask.swift

Co-authored-by: Alfonso Grillo <alfogrillo@gmail.com>

* Update ElementX/Sources/Services/Users/UserDiscoveryService.swift

Co-authored-by: Alfonso Grillo <alfogrillo@gmail.com>

* fix invite users and start chat errors

* use only one task to fetch user profile

---------

Co-authored-by: Alfonso Grillo <alfogrillo@gmail.com>
Co-authored-by: Doug <6060466+pixlwave@users.noreply.github.com>

ElementX/Sources/Mocks/Generated/GeneratedMocks.swift

@@ -874,4 +874,45 @@ class SessionVerificationControllerProxyMock: SessionVerificationControllerProxy
         }
     }
 }
+class UserDiscoveryServiceMock: UserDiscoveryServiceProtocol {
+
+    //MARK: - searchProfiles
+
+    var searchProfilesWithCallsCount = 0
+    var searchProfilesWithCalled: Bool {
+        return searchProfilesWithCallsCount > 0
+    }
+    var searchProfilesWithReceivedSearchQuery: String?
+    var searchProfilesWithReceivedInvocations: [String] = []
+    var searchProfilesWithReturnValue: Result<[UserProfile], UserDiscoveryErrorType>!
+    var searchProfilesWithClosure: ((String) async -> Result<[UserProfile], UserDiscoveryErrorType>)?
+
+    func searchProfiles(with searchQuery: String) async -> Result<[UserProfile], UserDiscoveryErrorType> {
+        searchProfilesWithCallsCount += 1
+        searchProfilesWithReceivedSearchQuery = searchQuery
+        searchProfilesWithReceivedInvocations.append(searchQuery)
+        if let searchProfilesWithClosure = searchProfilesWithClosure {
+            return await searchProfilesWithClosure(searchQuery)
+        } else {
+            return searchProfilesWithReturnValue
+        }
+    }
+    //MARK: - fetchSuggestions
+
+    var fetchSuggestionsCallsCount = 0
+    var fetchSuggestionsCalled: Bool {
+        return fetchSuggestionsCallsCount > 0
+    }
+    var fetchSuggestionsReturnValue: Result<[UserProfile], UserDiscoveryErrorType>!
+    var fetchSuggestionsClosure: (() async -> Result<[UserProfile], UserDiscoveryErrorType>)?
+
+    func fetchSuggestions() async -> Result<[UserProfile], UserDiscoveryErrorType> {
+        fetchSuggestionsCallsCount += 1
+        if let fetchSuggestionsClosure = fetchSuggestionsClosure {
+            return await fetchSuggestionsClosure()
+        } else {
+            return fetchSuggestionsReturnValue
+        }
+    }
+}
 // swiftlint:enable all

ElementX/Sources/Mocks/UserProfile+Mock.swift

@@ -26,6 +26,10 @@ extension UserProfile {
         .init(userID: "@bob:matrix.org", displayName: "Bob", avatarURL: nil)
     }
 
+    static var mockBobby: UserProfile {
+        .init(userID: "@bobby:matrix.org", displayName: "Bobby", avatarURL: nil)
+    }
+
     static var mockCharlie: UserProfile {
         .init(userID: "@charlie:matrix.org", displayName: "Charlie", avatarURL: nil)
     }