Add default UUID to byte array converter with little endian support

Since all binary data is stored in little endian format in ldap, it is not very obvious that the following objectGUID 90d1c68e-01be-4485-aafd-b3ffb9ddb026 should be converted to an octet string \8e\c6\d1\90\be\01\85\44\aa\fd\b3\ff\b9\dd\b0\26.

Please, provide the default converters for byte[] <-> java.util.UUID transformations. Here are some of my ideas for these converters:

@Component
class ByteArrayToUuidConverter : Converter<ByteArray, UUID> {
    override fun convert(guidBytes: ByteArray): UUID {
        require(guidBytes.size == 16) {
            "Guid bytes must be 16 byte long, but was ${guidBytes.size}"
        }
        val bytes = guidBytes.copyOf().apply {
            reverse(0, 4)
            reverse(4, 6)
            reverse(6, 8)
        }
        return ByteBuffer.wrap(bytes).let { UUID(it.long, it.long) }
    }
}

@Component
class UuidToByteArrayConverter : Converter<UUID, ByteArray> {
    override fun convert(source: UUID): ByteArray {
        val byteBuffer = ByteBuffer.wrap(ByteArray(16)).apply {
            putLong(source.mostSignificantBits)
            putLong(source.leastSignificantBits)
        }
        val guidBytes = byteBuffer.array().apply {
            reverse(0, 4)
            reverse(4, 6)
            reverse(6, 8)
        }
        return guidBytes
    }
}

The issue specifies the UUID and expected LDAP octet-string representation, along with converter sketches. Start by locating how default byte[] and UUID conversions are registered and where their tests belong; done means both conversion directions support the little-endian representation and reject byte arrays that are not 16 bytes long.