[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/cannotCastToFunction.sig.kt.txt

@@ -0,0 +1,35 @@
+// CHECK:
+//   Mangled name: IrElement
+//   Public signature: /IrElement|null[0]
+open class IrElement {
+  // CHECK:
+  //   Mangled name: IrElement#<init>(){}
+  //   Public signature: /IrElement.<init>|-5645683436151566731[0]
+  constructor() /* primary */
+
+}
+
+// CHECK JVM_IR:
+//   Mangled name: #dump@IrElement(kotlin.Boolean;kotlin.Boolean){}kotlin.String
+//   Public signature: /dump|-3225440066498389487[0]
+// CHECK JS_IR NATIVE:
+//   Mangled name: #dump@IrElement(kotlin.Boolean;kotlin.Boolean){}
+//   Public signature: /dump|773530586679184317[0]
+fun IrElement.dump(normalizeNames: Boolean, stableOrder: Boolean): String
+
+// CHECK JVM_IR:
+//   Mangled name: #dump(IrElement;kotlin.String){}kotlin.String
+//   Public signature: /dump|2660497428954829765[0]
+// CHECK JS_IR NATIVE:
+//   Mangled name: #dump(IrElement;kotlin.String){}
+//   Public signature: /dump|4886700334642684742[0]
+fun dump(data: IrElement, dumpStrategy: String): String
+
+// CHECK JVM_IR:
+//   Mangled name: #dumpKotlinLike@IrElement(kotlin.String){}kotlin.String
+//   Public signature: /dumpKotlinLike|4178458168806795646[0]
+// CHECK JS_IR NATIVE:
+//   Mangled name: #dumpKotlinLike@IrElement(kotlin.String){}
+//   Public signature: /dumpKotlinLike|-2371556323569177260[0]
+fun IrElement.dumpKotlinLike(options: String): String
+