Make custom serizalizers internal

Author: OptimumCode

src/commonMain/kotlin/io/github/optimumcode/json/pointer/JsonPointerSerializer.kt

@@ -7,7 +7,7 @@ import kotlinx.serialization.descriptors.SerialDescriptor
 import kotlinx.serialization.encoding.Decoder
 import kotlinx.serialization.encoding.Encoder
 
-public object JsonPointerSerializer : KSerializer<JsonPointer> {
+internal object JsonPointerSerializer : KSerializer<JsonPointer> {
   override val descriptor: SerialDescriptor =
     PrimitiveSerialDescriptor(
       "io.github.optimumcode.json.pointer.JsonPointer",

src/commonMain/kotlin/io/github/optimumcode/json/schema/AbsoluteLocation.kt

@@ -16,7 +16,7 @@ public data class AbsoluteLocation(
   val path: JsonPointer,
 )
 
-public object AbsoluteLocationSerializer : KSerializer<AbsoluteLocation> {
+internal object AbsoluteLocationSerializer : KSerializer<AbsoluteLocation> {
   override val descriptor: SerialDescriptor =
     PrimitiveSerialDescriptor(
       "com.optimumcode.json.schema.AbsoluteLocation",