[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/classes/delegatedImplementation.kt

@@ -1,3 +1,6 @@
+// MUTE_SIGNATURE_COMPARISON_K2: ANY
+// ^ KT-57754
+
 interface IBase {
     fun foo(x: Int, s: String)
     fun bar(): Int
@@ -28,4 +31,4 @@ fun otherImpl(x0: String, y0: Int): IOther = object : IOther {
 
 class Test1 : IBase by BaseImpl
 
-class Test2 : IBase by BaseImpl, IOther by otherImpl("", 42)
+class Test2 : IBase by BaseImpl, IOther by otherImpl("", 42)