[IR] Dump IdSignatures and mangled names in irText tests

The reason #1 for this feature is that we want to test IdSignatures
generated for declarations. Currently, there is no (easy) way to ensure
that a change in the signature building logic doesn't cause any breaking
changes wrt klibs.

Now, most IdSignatures include hashed mangled names in them, so even if
we catch a regression where the included hash changes, there would be no
way of knowing immediately what caused it, unless we'd also have mangled
names in the expectations.

The reason #2 is to test the manglers themselves. Currently, there are
no tests for them. They heavily duplicate each other, this is already
causing issues (see KT-57427) that would be very hard to catch without
these tests.

^KT-58238 Fixed

compiler/testData/ir/irText/firProblems/LocalSuspendFun.sig.kt.txt

@@ -0,0 +1,12 @@
+// CHECK:
+//   Mangled name: #foo(){}
+//   Public signature: /foo|-1041209573719867811[0]
+fun foo(): Unit
+
+// CHECK JVM_IR:
+//   Mangled name: #useMemo(kotlin.Function0<0:0>){0§<kotlin.Any?>}0:0
+//   Public signature: /useMemo|-5878263003233931724[0]
+// CHECK JS_IR NATIVE:
+//   Mangled name: #useMemo(kotlin.Function0<0:0>){0§<kotlin.Any?>}
+//   Public signature: /useMemo|-3060604648637761528[0]
+fun <T : Any?> useMemo(callback: Function0<T>): T