Set modifier order based on Kotlin coding conventions

[3flex]

https://kotlinlang.org/docs/reference/coding-conventions.html#modifiers

If a declaration has multiple modifiers, always put them in the following order:

public / protected / private / internal
expect / actual
final / open / abstract / sealed / const
external
override
lateinit
tailrec
vararg
suspend
inner
enum / annotation / fun // as a modifier in `fun interface`
companion
inline
infix
operator
data