chore: Remove unneeded convenience functions

Turns out these are already provided by kotlinx.serialization itself via
extension functions on `StringFormat`, see [1].

[1]: https://github.com/Kotlin/kotlinx.serialization/blob/d4d066d72a9f92f06c640be5a36a22f75d0d7659/core/commonMain/src/kotlinx/serialization/SerialFormat.kt#L106-L123

src/commonMain/kotlin/com/charleskorn/kaml/Yaml.kt

@@ -52,9 +52,6 @@ public class Yaml(
         return input.decodeSerializableValue(deserializer)
     }
 
-    public inline fun <reified T> decodeFromString(string: String): T =
-        decodeFromString(serializersModule.serializer<T>(), string)
-
     override fun <T> decodeFromString(
         deserializer: DeserializationStrategy<T>,
         string: String,
@@ -98,9 +95,6 @@ public class Yaml(
         encodeToBufferedSink(serializer, value, sink.buffer())
     }
 
-    public inline fun <reified T> encodeToString(value: T): String =
-        encodeToString(serializersModule.serializer<T>(), value)
-
     override fun <T> encodeToString(
         serializer: SerializationStrategy<T>,
         value: T,