[Injection] Introduce PlatformSpecificExtensions and PlatformExtensionsClashResolver

This commit introduces the ability to register a PlatformExtensionClashResolver
in a container. Each PlatformExtensionClashResolver has a corresponding
PlatformSpecificExtensions.

If, during container composition, several instances of
PlatformSpecificExtensions were registred, instead of throwing
InvalidCardinalityException, corresponding PlatformExtensionClashResolver
will be asked to resolve clash.

This allows to make injection more composable and less coupled across
different contributors of service, providing a basis for such motivating
cases as composing containers with both JS and JVM services (for analysis
of multiplatform modules).
Previously, that would be impossible:
a) JS would inject default instances for some services which would clash
with non-default JVM services (like SyntheticScopes)
b) Also, there are a very few services for which *both* platforms provide
non-default implementations, so they should be merged manually on
case-by-case basis (e.g., IdentifierChecker)

core/descriptors/src/org/jetbrains/kotlin/types/dynamicTypes.kt

@@ -18,6 +18,8 @@ package org.jetbrains.kotlin.types
 
 import org.jetbrains.kotlin.builtins.KotlinBuiltIns
 import org.jetbrains.kotlin.container.DefaultImplementation
+import org.jetbrains.kotlin.container.PlatformExtensionsClashResolver
+import org.jetbrains.kotlin.container.PlatformSpecificExtension
 import org.jetbrains.kotlin.descriptors.annotations.Annotations
 import org.jetbrains.kotlin.renderer.DescriptorRenderer
 import org.jetbrains.kotlin.renderer.DescriptorRendererOptions
@@ -25,7 +27,7 @@ import org.jetbrains.kotlin.types.model.DynamicTypeMarker
 import org.jetbrains.kotlin.types.typeUtil.builtIns
 
 @DefaultImplementation(impl = DynamicTypesSettings::class)
-open class DynamicTypesSettings {
+open class DynamicTypesSettings : PlatformSpecificExtension<DynamicTypesSettings> {
     open val dynamicTypesAllowed: Boolean
         get() = false
 }