Introduce basic suspend conversion in FE

#KT-15917 In Progress

compiler/testData/diagnostics/tests/suspendConversion/basicSuspendConversionGenerics.fir.kt

@@ -0,0 +1,30 @@
+// !LANGUAGE: +SuspendConversion
+// !DIAGNOSTICS: -UNUSED_PARAMETER -UNUSED_EXPRESSION
+
+class Inv2<T, K>
+
+fun <T> foo1(f: suspend (T) -> String): T = TODO()
+fun <T> foo2(f: suspend () -> T): T = TODO()
+fun <T, K> foo3(f: suspend (T) -> K): Inv2<T, K> = TODO()
+
+fun <I> id(e: I): I = e
+
+fun test(f: (Int) -> String, g: () -> String) {
+    val a0 = <!INAPPLICABLE_CANDIDATE!>foo1<!>(f)
+    a0
+
+    val a1 = <!INAPPLICABLE_CANDIDATE!>foo2<!>(g)
+    a1
+
+    val a2 = <!INAPPLICABLE_CANDIDATE!>foo3<!>(f)
+    a2
+
+    val a3 = <!INAPPLICABLE_CANDIDATE!>foo1<!>(id(f))
+    a3
+
+    val a4 = <!INAPPLICABLE_CANDIDATE!>foo2<!>(id(g))
+    a4
+
+    val a5 = <!INAPPLICABLE_CANDIDATE!>foo3<!>(id(f))
+    a5
+}