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

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

idea/idea-completion/testData/smart/lambdaSignature/SuspendExplicitParameterTypesRequired.kt

@@ -0,0 +1,11 @@
+fun foo(p: suspend (String, Int) -> Unit){}
+fun foo(p: suspend Any.(Char, xx: Any) -> Unit){}
+
+fun bar() {
+    foo { <caret> }
+}
+
+// EXIST: "String, Int ->"
+// EXIST: "Char, xx ->"
+// ABSENT: "s, i ->"
+// ABSENT: "c, xx ->"