FIR IDE: add APIs about FunctionClassKind

analysis/analysis-api/testData/components/functionClassKind/function.kt

@@ -0,0 +1,7 @@
+fun <T, R> foo(p: T, mapper : (T) -> R): R {
+    mapper(p)
+}
+
+fun bar() {
+    foo(1, x<caret>y)
+}

analysis/analysis-api/testData/components/functionClassKind/function.txt

@@ -0,0 +1,3 @@
+expression: xy
+expected type: (T) -> R
+functionClassKind: Function

analysis/analysis-api/testData/components/functionClassKind/kFunction.kt

@@ -0,0 +1,11 @@
+// WITH_REFLECT
+
+import kotlin.reflect.KFunction1
+
+fun <T, R> foo(p: T, mapper : (T) -> R): R {
+    mapper(p)
+}
+
+fun bar() {
+    foo(1, x<caret>y as KFunction1<Int, String>)
+}

analysis/analysis-api/testData/components/functionClassKind/kFunction.txt

@@ -0,0 +1,3 @@
+expression: xy
+expected type: (kotlin.Int) -> kotlin.String
+functionClassKind: KFunction

analysis/analysis-api/testData/components/functionClassKind/kSuspendFunction.kt

@@ -0,0 +1,11 @@
+// WITH_REFLECT
+
+import kotlin.reflect.KSuspendFunction0
+
+fun foo(pause : suspend () -> Unit) {
+    pause()
+}
+
+fun bar() {
+    foo(x<caret>y as KSuspendFunction0<Unit>)
+}

analysis/analysis-api/testData/components/functionClassKind/kSuspendFunction.txt

@@ -0,0 +1,3 @@
+expression: xy
+expected type: suspend () -> kotlin.Unit
+functionClassKind: KSuspendFunction

analysis/analysis-api/testData/components/functionClassKind/suspendFunction.kt

@@ -0,0 +1,7 @@
+fun foo(pause : suspend () -> Unit) {
+    pause()
+}
+
+fun bar() {
+    foo(x<caret>y)
+}

analysis/analysis-api/testData/components/functionClassKind/suspendFunction.txt

@@ -0,0 +1,3 @@
+expression: xy
+expected type: suspend () -> kotlin.Unit
+functionClassKind: SuspendFunction