KT-35258 Add better completion for MixedNamedArgumentsInTheirOwnPosition feature

- When named parameter is on its own position, the completion of the next argument will not be limited by named arguments only
- The completion will not suggest already used arguments names
- ^KT-35258 Fixed

idea/idea-completion/testData/basic/common/namedArguments/NamedArgumentOnIncorrectPosition.kt

@@ -0,0 +1,10 @@
+fun foo(p1: Int, p2: Int, p3: Long) {}
+
+fun usage(param: Long) {
+    foo(p2 = 10, <caret>)
+}
+
+// LANGUAGE_VERSION: 1.4
+// EXIST: { itemText: "p1 =" }
+// EXIST: { itemText: "p3 =" }
+// NOTHING_ELSE

idea/idea-completion/testData/basic/common/namedArguments/NamedArgumentOnItsOwnPosition.kt

@@ -0,0 +1,11 @@
+fun foo(p1: Int, p2: Int, p3: Long) {}
+
+fun usage(param: Long) {
+    foo(p1 = 10, <caret>)
+}
+
+// LANGUAGE_VERSION: 1.4
+// EXIST: param
+// EXIST: { itemText: "p2 =" }
+// EXIST: { itemText: "p3 =" }
+// ABSENT: { itemText: "p1 =" }

idea/idea-completion/testData/basic/common/namedArguments/NamedArgumentOnItsOwnPosition2.kt

@@ -0,0 +1,13 @@
+fun foo(p1: Int, p2: Int, p3: Int, p4: Int, p5: Int) {}
+
+fun usage(param: Int) {
+    foo(0, p2 = 10, 20, p4 = 30, <caret>)
+}
+
+// LANGUAGE_VERSION: 1.4
+// EXIST: param
+// EXIST: { itemText: "p5 =" }
+// ABSENT: { itemText: "p1 =" }
+// ABSENT: { itemText: "p2 =" }
+// ABSENT: { itemText: "p3 =" }
+// ABSENT: { itemText: "p4 =" }