[FIR] Fix translation of invokes & add return expressions for lambdas

* fixed NoSuchMethod caused by mismatched signatures of the "invoke" method generated for lambda arguments
* added test cases in invoke.kt for KFunction and anonymous functions
* added a transformer to wrap the last expression in the bodies of lambdas with return

compiler/testData/codegen/box/callableReference/function/newArray.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 private fun <T> upcast(value: T): T = value
 
 fun box(): String {

compiler/testData/codegen/box/callableReference/function/overloadedFun.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND_FIR: JVM_IR
 fun foo(): String = "foo1"
 fun foo(i: Int): String = "foo2"