[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/expressions/simpleUnaryOperators.sig.kt.txt

@@ -0,0 +1,48 @@
+// CHECK JVM_IR:
+//   Mangled name: #test1(kotlin.Int){}kotlin.Int
+//   Public signature: /test1|135491646798962448[0]
+// CHECK JS_IR NATIVE:
+//   Mangled name: #test1(kotlin.Int){}
+//   Public signature: /test1|-3111244057316668638[0]
+fun test1(x: Int): Int
+
+// CHECK JVM_IR:
+//   Mangled name: #test2(){}kotlin.Int
+//   Public signature: /test2|5542371834528279174[0]
+// CHECK JS_IR NATIVE:
+//   Mangled name: #test2(){}
+//   Public signature: /test2|4279114864133353152[0]
+fun test2(): Int
+
+// CHECK JVM_IR:
+//   Mangled name: #test3(kotlin.Int){}kotlin.Int
+//   Public signature: /test3|4444212326709071419[0]
+// CHECK JS_IR NATIVE:
+//   Mangled name: #test3(kotlin.Int){}
+//   Public signature: /test3|7508947747710505690[0]
+fun test3(x: Int): Int
+
+// CHECK JVM_IR:
+//   Mangled name: #test4(){}kotlin.Int
+//   Public signature: /test4|3513867399525975921[0]
+// CHECK JS_IR NATIVE:
+//   Mangled name: #test4(){}
+//   Public signature: /test4|5588455914500386239[0]
+fun test4(): Int
+
+// CHECK JVM_IR:
+//   Mangled name: #test5(kotlin.Boolean){}kotlin.Boolean
+//   Public signature: /test5|5789064363105651650[0]
+// CHECK JS_IR NATIVE:
+//   Mangled name: #test5(kotlin.Boolean){}
+//   Public signature: /test5|-1911074993921234175[0]
+fun test5(x: Boolean): Boolean
+
+// CHECK JVM_IR:
+//   Mangled name: #test6(){}kotlin.Boolean
+//   Public signature: /test6|8631689306238556839[0]
+// CHECK JS_IR NATIVE:
+//   Mangled name: #test6(){}
+//   Public signature: /test6|-6357717956567725919[0]
+fun test6(): Boolean
+