Add ConnectionGetId functor

Sources/ElixxirDAppsSDK/Connection.swift

 import Bindings
 
 public struct Connection {
-  // TODO:
+  public var getId: ConnectionGetId
 }
 
 extension Connection {
   public static func live(_ bindingsConnection: BindingsConnection) -> Connection {
-    Connection()
+    Connection(
+      getId: .live(bindingsConnection)
+    )
   }
 
   public static func live(_ bindingsConnection: BindingsAuthenticatedConnection) -> Connection {
-    Connection()
+    Connection(
+      getId: .live(bindingsConnection)
+    )
   }
 }
 
 extension Connection {
-  public static let unimplemented = Connection()
+  public static let unimplemented = Connection(
+    getId: .unimplemented
+  )
 }

Sources/ElixxirDAppsSDK/ConnectionGetId.swift

+import Bindings
+import XCTestDynamicOverlay
+
+public struct ConnectionGetId {
+  public var run: () -> Int
+
+  public func callAsFunction() -> Int {
+    run()
+  }
+}
+
+extension ConnectionGetId {
+  public static func live(_ bindingsConnection: BindingsConnection) -> ConnectionGetId {
+    ConnectionGetId(run: bindingsConnection.getId)
+  }
+
+  public static func live(_ bindingsConnection: BindingsAuthenticatedConnection) -> ConnectionGetId {
+    ConnectionGetId(run: bindingsConnection.getId)
+  }
+}
+
+extension ConnectionGetId {
+  public static let unimplemented = ConnectionGetId(
+    run: XCTUnimplemented("\(Self.self)")
+  )
+}

Sources/ElixxirDAppsSDK/Legacy/ConnectionIdProvider.swift

-import Bindings
-
-public struct ConnectionIdProvider {
-  public var get: () -> Int
-
-  public func callAsFunction() -> Int {
-    get()
-  }
-}
-
-extension ConnectionIdProvider {
-  public static func live(
-    bindingsConnection: BindingsConnection
-  ) -> ConnectionIdProvider {
-    ConnectionIdProvider(get: bindingsConnection.getId)
-  }
-
-  public static func live(
-    bindingsAuthenticatedConnection: BindingsAuthenticatedConnection
-  ) -> ConnectionIdProvider {
-    ConnectionIdProvider(get: bindingsAuthenticatedConnection.getId)
-  }
-}
-
-#if DEBUG
-extension ConnectionIdProvider {
-  public static let failing = ConnectionIdProvider {
-    fatalError("Not implemented")
-  }
-}
-#endif