✨ New Zero type

[LVMVRQUXL]

It could be nice to introduce a Zero type in the kotools.types.number package for representing the real life concept of the zero number.

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Technically, this type could be a singleton, meaning that we should provide only one instance of the Zero type.
Here's an example of getting an instance of Zero from Kotlin code:

println(Zero) // 0

Here's the same example from Java code:

final Zero zero = Zero.INSTANCE;
println(Zero) // 0

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An instance of the Zero type should at least be convertible to Byte.

val first: Byte = 0.toByte()
val second: Byte = Zero.toByte()
println(first == second) // true

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The serialization and deserialization processes of this type should behave like for the Byte type.
Here's an example of Kotlin code that encodes and decodes this type using the JavaScript Object Notation (JSON) format from kotlinx.serialization:

val encoded: String = Json.encodeToString(Zero)
println(encoded) // 0
val decoded: Zero = Json.decodeFromString(encoded)
println(Zero == decoded) // true

[LVMVRQUXL]

Done in 2df18e4. Its serializer will be provided in future commits.