Add enum utilities and add enum with holes support

[lchenut]

Add one macro and one procedure:

• macro enumRangeOrd(e: type[enum]): untyped
  Creates an array with all the ordinal value of an enum (sorted by default from what I saw)

type
  Test = enum
    A1 = 1, B1 = 2, C1 = 3
  TestWithHoles = enum
    A2 = 1, B2 = 3, C2 = 5
assert(enumRangeOrd(Test) == [ 1, 2, 3 ])
assert(enumRangeOrd(TestWithHoles) == [ 1, 3, 5 ])

• proc contains(e: type[enum], v: SomeInteger): bool
  With the macro described above, it checks if an integer is in the enum, in order to use someInt in / notin RandomEnum

In addition to that, I use those two macro/proc to implement the hole management in the macro hasHoles and the proc checkEnumAssign

[Menduist]

This PR doesn't work when used with other types than int

Eg, 5.byte in SomeEnum

Also, since hasHoles is used in contains, put hasHoles first (it's causing issues in some cases currently)

[zah]

Using mapIt here would be a bit inefficient as it would allocate a sequence just to perform the check. It would be better to directly produce an int64 array in enumRangeOrd.