[Feature Request] Unify `Support` syntax for all Distributions about fsharp.stats

[bvenn]

I think the best way to model the support is to use FSharp.Stats.Inverval<'a>. Intervals support generic type inputs, therefore even multidimensional distributions would be covered.

[smoothdeveloper]

FSharp.Stats/src/FSharp.Stats/Intervals.fs

Lines 7 to 9 in 7de8b82

	type Interval<'a> =
	| ClosedInterval of 'a * 'a
	| Empty

We may consider having static member (for overloads) or at least the first one:

ofTuple: ('a * 'a) -> Interval<'a>
ofTuple: ('a * 'a) option -> Interval<'a>

Should the implementation do a comparison in case the values are swapped, and what should occur if they are?

Also, may be useful to offer the reverse:

toTuple: 'a Interval -> ('a * 'a) option

If the type is meant only for closed interval (rather than a larger set of those), maybe it is better to just name it ClosedInterval also.

[bvenn]

Totally agree to the ofTuple and toTuple member:+1:

I'm not sure if in any case it is allowed to have endValue < startValue. I dont't think so and therefore I would add a check that fails if the input is meaningless.

It may be an option to update the Interval type with a Type property that sets if the interval is closed/halfopen_right/halfopen_left/open.