[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/reflectFindAnnotationOnDefaultMethodParameter.sig.kt.txt

@@ -0,0 +1,28 @@
+// CHECK:
+//   Mangled name: Ann
+//   Public signature: /Ann|null[0]
+open annotation class Ann : Annotation {
+  // CHECK:
+  //   Mangled name: Ann#<init>(){}
+  //   Public signature: /Ann.<init>|-5645683436151566731[0]
+  constructor() /* primary */
+
+}
+
+// CHECK:
+//   Mangled name: I
+//   Public signature: /I|null[0]
+interface I {
+
+  // CHECK:
+  //   Mangled name: I#m(kotlin.String){}
+  //   Public signature: /I.m|934693771674457301[0]
+  fun m(@Ann s: String): Unit
+
+}
+
+// CHECK JVM_IR:
+//   Mangled name: #box(){}kotlin.String
+//   Public signature: /box|-9347091776561469[0]
+fun box(): String
+