[KxSerialization] Added inspection on abstract custom serializer

Serialization requires an instance of the serializer, which cannot be obtained with the passed interface, abstract or sealed class.
Therefore, the specifying of such classes in `Serializable` annotation must be prohibited.

Fixes https://github.com/Kotlin/kotlinx.serialization/issues/2173
Relates #KT-58036

Merge-request: KT-MR-10753
Merged-by: Sergey Shanshin <Sergey.Shanshin@jetbrains.com>

plugins/kotlinx-serialization/testData/diagnostics/abstractCustomSerializer.kt

@@ -0,0 +1,37 @@
+// FIR_DISABLE_LAZY_RESOLVE_CHECKS
+// FIR_IDENTICAL
+// SKIP_TXT
+// WITH_STDLIB
+
+// FILE: test.kt
+import kotlinx.serialization.*
+
+
+interface InterfaceSerializer: KSerializer<WithInterfaceSerializer>
+
+<!ABSTRACT_SERIALIZER_TYPE!>@Serializable(InterfaceSerializer::class)<!>
+class WithInterfaceSerializer(val i: Int)
+
+
+abstract class AbstractSerializer: KSerializer<WithAbstract>
+
+<!ABSTRACT_SERIALIZER_TYPE!>@Serializable(AbstractSerializer::class)<!>
+class WithAbstract(val i: Int)
+
+
+sealed class SealedSerializer: KSerializer<WithSealed>
+
+<!ABSTRACT_SERIALIZER_TYPE!>@Serializable(SealedSerializer::class)<!>
+class WithSealed(val i: Int)
+
+@Serializable
+class Holder (
+    <!ABSTRACT_SERIALIZER_TYPE!>@Serializable(InterfaceSerializer::class)<!>
+val withInterface: WithInterfaceSerializer,
+
+<!ABSTRACT_SERIALIZER_TYPE!>@Serializable(AbstractSerializer::class)<!>
+val withAbstract: WithAbstract,
+
+<!ABSTRACT_SERIALIZER_TYPE!>@Serializable(SealedSerializer::class)<!>
+val withSealed: WithSealed
+)