KT-29926: Support completion of suspend lambda parameters in the body

- `suspendLambdaSignature` directory is just a copy of `lambdaSignature`

idea/idea-completion/testData/handlers/smart/suspendLambdaSignature/NoAdditionalSpace.kt

@@ -0,0 +1,7 @@
+fun foo(p: suspend (x: Char, String) -> Unit){}
+
+fun bar() {
+    foo { <caret> }
+}
+
+// ELEMENT: "x, s ->"

idea/idea-completion/testData/handlers/smart/suspendLambdaSignature/NoAdditionalSpace.kt.after

@@ -0,0 +1,7 @@
+fun foo(p: suspend (x: Char, String) -> Unit){}
+
+fun bar() {
+    foo { x, s -> <caret> }
+}
+
+// ELEMENT: "x, s ->"

idea/idea-completion/testData/handlers/smart/suspendLambdaSignature/Simple.kt

@@ -0,0 +1,7 @@
+fun foo(p: suspend (x: Char, String) -> Unit){}
+
+fun bar() {
+    foo { <caret>}
+}
+
+// ELEMENT: "x, s ->"

idea/idea-completion/testData/handlers/smart/suspendLambdaSignature/Simple.kt.after

@@ -0,0 +1,7 @@
+fun foo(p: suspend (x: Char, String) -> Unit){}
+
+fun bar() {
+    foo { x, s -> <caret> }
+}
+
+// ELEMENT: "x, s ->"