Add correct equals/hashCode to KtSymbolBasedAbstractTypeConstructor

Previously there were no equals/hashCode implementation.
Because of that subtyping not working properly. That is because in
subtyping we have checks that type constructors are equals

Also toString was added so now it is a bit easier to debug code
involving the KtSymbolBasedAbstractTypeConstructor

idea/testData/intentions/conventionNameCalls/replaceContains/containsFromJava.kt

@@ -1,4 +1,3 @@
-// IGNORE_FE10_BINDING_BY_FIR
 fun foo() {
     val c = Container()
     c.cont<caret>ains(1)

idea/testData/intentions/conventionNameCalls/replaceContains/containsFromJava.kt.after

@@ -1,4 +1,3 @@
-// IGNORE_FE10_BINDING_BY_FIR
 fun foo() {
     val c = Container()
     1 in c

idea/testData/intentions/conventionNameCalls/replaceContains/containsInExpression.kt

@@ -1,4 +1,3 @@
-// IGNORE_FE10_BINDING_BY_FIR
 fun <T> doSomething(a: T) {}
 
 fun test() {

idea/testData/intentions/conventionNameCalls/replaceContains/containsInExpression.kt.after

@@ -1,4 +1,3 @@
-// IGNORE_FE10_BINDING_BY_FIR
 fun <T> doSomething(a: T) {}
 
 fun test() {

idea/testData/intentions/conventionNameCalls/replaceContains/extensionFunction.kt

@@ -1,4 +1,3 @@
-// IGNORE_FE10_BINDING_BY_FIR
 fun test() {
     class Test()
     operator fun Test.contains(a: Int) : Boolean = true

idea/testData/intentions/conventionNameCalls/replaceContains/extensionFunction.kt.after

@@ -1,4 +1,3 @@
-// IGNORE_FE10_BINDING_BY_FIR
 fun test() {
     class Test()
     operator fun Test.contains(a: Int) : Boolean = true

idea/testData/intentions/conventionNameCalls/replaceContains/notContains.kt

@@ -1,4 +1,3 @@
-// IGNORE_FE10_BINDING_BY_FIR
 fun test() {
     class Test{
         operator fun contains(a: Int) : Boolean = true

idea/testData/intentions/conventionNameCalls/replaceContains/notContains.kt.after

@@ -1,4 +1,3 @@
-// IGNORE_FE10_BINDING_BY_FIR
 fun test() {
     class Test{
         operator fun contains(a: Int) : Boolean = true

idea/testData/intentions/conventionNameCalls/replaceContains/qualifier.kt

@@ -1,4 +1,3 @@
-// IGNORE_FE10_BINDING_BY_FIR
 class C {
     companion object {
         operator fun contains(s: String) = true

idea/testData/intentions/conventionNameCalls/replaceContains/qualifier.kt.after

@@ -1,4 +1,3 @@
-// IGNORE_FE10_BINDING_BY_FIR
 class C {
     companion object {
         operator fun contains(s: String) = true

idea/testData/intentions/conventionNameCalls/replaceContains/simpleArgument.kt

@@ -1,4 +1,3 @@
-// IGNORE_FE10_BINDING_BY_FIR
 fun test() {
     class Test{
         operator fun contains(a: Int) : Boolean = true

idea/testData/intentions/conventionNameCalls/replaceContains/simpleArgument.kt.after

@@ -1,4 +1,3 @@
-// IGNORE_FE10_BINDING_BY_FIR
 fun test() {
     class Test{
         operator fun contains(a: Int) : Boolean = true

idea/testData/intentions/conventionNameCalls/replaceContains/simpleStringLiteral.kt

@@ -1,4 +1,3 @@
-// IGNORE_FE10_BINDING_BY_FIR
 @Suppress("INAPPLICABLE_OPERATOR_MODIFIER")
 public operator fun CharSequence.contains(other: CharSequence, ignoreCase: Boolean = false): Boolean = false
 fun test() {

idea/testData/intentions/conventionNameCalls/replaceContains/simpleStringLiteral.kt.after

@@ -1,4 +1,3 @@
-// IGNORE_FE10_BINDING_BY_FIR
 @Suppress("INAPPLICABLE_OPERATOR_MODIFIER")
 public operator fun CharSequence.contains(other: CharSequence, ignoreCase: Boolean = false): Boolean = false
 fun test() {

idea/testData/intentions/conventionNameCalls/replaceContains/typeArguments.kt

@@ -1,4 +1,3 @@
-// IGNORE_FE10_BINDING_BY_FIR
 fun test() {
     class Test{
         operator fun <T> contains(a: T): Boolean = false

idea/testData/intentions/conventionNameCalls/replaceContains/typeArguments.kt.after

@@ -1,4 +1,3 @@
-// IGNORE_FE10_BINDING_BY_FIR
 fun test() {
     class Test{
         operator fun <T> contains(a: T): Boolean = false