✨ New design for creating types

[LVMVRQUXL]

Our current API providing a heavy usage of the Result type and extension functions for creating types, we want to improve the design by providing constructors, orNull and orThrow factory methods on companion object instead. Here's the guidelines for choosing between one of them:

• Creation needs no validation -> use a constructor.
• Creation needs validation and should throw an exception in case of invalid inputs -> use an orThrow factory method on companion object.
• Creation needs validation and should return null in case of invalid inputs -> use an orNull factory method on companion object.

Here's an example of creating a PositiveInt:

// Actual
val first: PositiveInt = 123.toPositiveInt().getOrThrow()
val second: PositiveInt? = 123.toPositiveInt().getOrNull()

// Idea
val first: PositiveInt = PositiveInt.orThrow(123)
val second: PositiveInt? = PositiveInt.orNull(123)

Finally, due to the non-explicit support of nullable types in Java, the orNull factory methods should be only accessible on Kotlin.