Broadcast arithmetic operators for OneElement

[jishnub]

On master

julia> v = OneElement(2, 3, 4)
4-element OneElement{Int64, 1, Tuple{Int64}, Tuple{Base.OneTo{Int64}}}:
 ⋅
 ⋅
 2
 ⋅

julia> v * 2
4-element OneElement{Int64, 1, Tuple{Int64}, Tuple{Base.OneTo{Int64}}}:
 ⋅
 ⋅
 4
 ⋅

julia> v .* 2
4-element Vector{Int64}:
 0
 0
 4
 0

This PR

julia> v .* 2
4-element OneElement{Int64, 1, Tuple{Int64}, Tuple{Base.OneTo{Int64}}}:
 ⋅
 ⋅
 4
 ⋅

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c7c34aa) 99.89% compared to head (9765630) 99.89%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #331   +/-   ##
=======================================
  Coverage   99.89%   99.89%           
=======================================
  Files           8        8           
  Lines         920      934   +14     
=======================================
+ Hits          919      933   +14     
  Misses          1        1           

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