Consider adding a `@NbtSerialName` annotation

[BenWoodworth]

Would have the same functionality as @SerialName, but takes precedence when serializing NBT

see: https://github.com/Kotlin/kotlinx.serialization/issues/2104

Naming considerations:

• @NbtSerialName
  • @XmlSerialName
• @NbtName
  • @JsonNames

(I checked all officially/community supported formats for related @SerialInfo annotation classes)

[BenWoodworth]

Superseded by #29

Opting to add a separate annotation to encompass the serialized root tag name behavior, removing the need for empty @SerialNames