Allow open callable members in expect interfaces

#KT-42094 fixed

compiler/testData/diagnostics/tests/multiplatform/expectInterfaceApplicability.fir.kt

@@ -0,0 +1,25 @@
+// !LANGUAGE: +MultiPlatformProjects
+// MODULE: m1-common
+// FILE: common.kt
+// TODO: .fir.kt version is just a stub.
+expect interface My {
+    open fun openFunPositive()
+    open fun openFunNegative()
+    abstract fun abstractFun()
+
+    open val openValPositive: Int
+    open val openValNegative: Int
+    abstract val abstractVal: Int
+}
+
+// MODULE: m1-jvm(m1-common)
+// FILE: jvm.kt
+actual interface My {
+    actual fun openFunPositive() = Unit
+    actual fun openFunNegative()
+    actual fun abstractFun()
+
+    actual val openValPositive: Int get() = 0
+    actual val openValNegative: Int
+    actual val abstractVal: Int
+}

compiler/testData/diagnostics/tests/multiplatform/expectInterfaceApplicability.kt

@@ -0,0 +1,25 @@
+// !LANGUAGE: +MultiPlatformProjects
+// MODULE: m1-common
+// FILE: common.kt
+// TODO: .fir.kt version is just a stub.
+expect interface My {
+    open fun openFunPositive()
+    open fun openFunNegative()
+    abstract fun abstractFun()
+
+    open val openValPositive: Int
+    open val openValNegative: Int
+    abstract val abstractVal: Int
+}
+
+// MODULE: m1-jvm(m1-common)
+// FILE: jvm.kt
+actual interface My {
+    actual fun openFunPositive() = Unit
+    actual fun <!ACTUAL_WITHOUT_EXPECT!>openFunNegative<!>()
+    actual fun abstractFun()
+
+    actual val openValPositive: Int get() = 0
+    actual val <!ACTUAL_WITHOUT_EXPECT!>openValNegative<!>: Int
+    actual val abstractVal: Int
+}

compiler/testData/diagnostics/tests/multiplatform/expectInterfaceApplicability.txt

@@ -0,0 +1,30 @@
+// -- Module: <m1-common> --
+package
+
+public expect interface My {
+    public expect abstract val abstractVal: kotlin.Int
+    public expect open val openValNegative: kotlin.Int
+    public expect open val openValPositive: kotlin.Int
+    public abstract expect fun abstractFun(): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open expect fun openFunNegative(): kotlin.Unit
+    public open expect fun openFunPositive(): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+
+// -- Module: <m1-jvm> --
+package
+
+public actual interface My {
+    public actual abstract val abstractVal: kotlin.Int
+    public actual abstract val openValNegative: kotlin.Int
+    public actual open val openValPositive: kotlin.Int
+    public abstract actual fun abstractFun(): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public abstract actual fun openFunNegative(): kotlin.Unit
+    public open actual fun openFunPositive(): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}