[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/declarations/contextReceivers/class.sig.kt.txt

@@ -0,0 +1,50 @@
+// CHECK:
+//   Mangled name: Inner
+//   Public signature: /Inner|null[0]
+class Inner {
+  // CHECK:
+  //   Mangled name computed from Ir:         Inner#<init>(Outer;kotlin.Any){}
+  //   Mangled name computed from Descriptor: Inner#<init>!Outer(kotlin.Any){}
+  //   Public signature: /Inner.<init>|7428094623108856579[0]
+  constructor($context_receiver_0: Outer, arg: Any) /* primary */
+  // CHECK:
+  //   Mangled name computed from Ir:         Inner.contextReceiverField0
+  //   Mangled name computed from Descriptor: Inner{}contextReceiverField0#jf
+  private /* final field */ val contextReceiverField0: Outer
+
+  // CHECK JVM_IR:
+  //   Mangled name: Inner#bar(){}kotlin.Int
+  //   Public signature: /Inner.bar|-6436649210114349217[0]
+  fun bar(): Int
+
+}
+
+// CHECK:
+//   Mangled name: Outer
+//   Public signature: /Outer|null[0]
+class Outer {
+  // CHECK:
+  //   Mangled name: Outer{}x
+  //   Public signature: /Outer.x|-8060530855978347579[0]
+  val x: Int
+    field
+    // CHECK JVM_IR:
+    //   Mangled name: Outer#<get-x>(){}kotlin.Int
+    //   Public signature: /Outer.x.<get-x>|4966956098150895696[0]
+    get
+
+  // CHECK:
+  //   Mangled name: Outer#<init>(){}
+  //   Public signature: /Outer.<init>|-5645683436151566731[0]
+  constructor() /* primary */
+
+}
+
+// CHECK:
+//   Mangled name: #f(Outer){}
+//   Public signature: /f|-90367846469451219[0]
+fun f(outer: Outer): Unit
+  // CHECK JVM_IR:
+  //   Mangled name: #f(Outer){}#<anonymous>#static@Outer(){}Inner
+  local fun Outer.<anonymous>(): Inner
+