Make reshape accept a combination of Integers, Base.OneTo and a single Colon consistently

[jishnub]

This collects the less controversial fixes from #41003.

After this PR, the following will work:

julia> reshape(1:3, Int8(1), :)
1×3 reshape(::UnitRange{Int64}, 1, 3) with eltype Int64:
 1  2  3

julia> reshape(1:3, Base.OneTo(1), :)
1×3 reshape(::UnitRange{Int64}, 1, 3) with eltype Int64:
 1  2  3

julia> reshape(1:3, Base.OneTo(1), :, 1)
1×3×1 reshape(::UnitRange{Int64}, 1, 3, 1) with eltype Int64:
[:, :, 1] =
 1  2  3

[vtjnash]

This feels like it should be:

Suggested change

	reshape(parent::AbstractArray, dims::Tuple{Vararg{Union{Integer,Colon,Base.OneTo}}}) = reshape(parent, _reshape_uncolon(parent, dims))
	reshape(parent::AbstractArray, dims::Tuple) = reshape(parent, _reshape_uncolon(parent, dims))

wdyt?

[timholy]

I like it, although perhaps worth mentioning that this almost makes _reshape_uncolon part of the API (it becomes a tempting target for package specialization).

[DilumAluthge]

Is this PR still needed? If so, @jishnub can you rebase and fix the merge conflicts?