Add isonebased trait to opt out of OffsetArray wrappers

[jishnub]

The idea is

julia> OffsetArrays.no_offset_view(SMatrix{2,2}(1:4))
2×2 OffsetArray(::SMatrix{2, 2, Int64, 4}, 1:2, 1:2) with eltype Int64 with indices 1:2×1:2:
 1  3
 2  4

julia> OffsetArrays.isonebased(::SOneTo) = true

julia> OffsetArrays.no_offset_view(SMatrix{2,2}(1:4)) # no wrapper anymore
2×2 SMatrix{2, 2, Int64, 4} with indices SOneTo(2)×SOneTo(2):
 1  3
 2  4

Also, in this case, the similar method in this package will forward the lengths of the axes to Base, so the result will usually be an Array instead of an OffsetArray:

julia> similar(rand(2), Int, Base.IdentityUnitRange(Base.OneTo(2)))
2-element Vector{Int64}:
              -1
 140522905523888

[codecov]

Codecov Report

Merging #335 (71565b6) into master (1cae070) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #335      +/-   ##
==========================================
+ Coverage   98.67%   98.69%   +0.02%     
==========================================
  Files           5        5              
  Lines         452      459       +7     
==========================================
+ Hits          446      453       +7     
  Misses          6        6              

Impacted Files	Coverage Δ
src/OffsetArrays.jl	98.33% <100.00%> (+0.03%)	⬆️

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