Support for `hadamard` (`⊙`) for `TransparentColor`s

[kimikage]

Unlike dot(⋅) / tensor(⊗), hadamard(⊙) for TransparentColors seems to be clear in its definition. However, currently it is not supported.

julia> argb = ARGB(0.5, 0.25, 0, 1)
ARGB{Float64}(0.5,0.25,0.0,1.0)

julia> argb ⊙ argb
ERROR: MethodError: no method matching hadamard(::ARGB{Float64}, ::ARGB{Float64})

julia> mapc(*, argb, argb)
ARGB{Float64}(0.25,0.0625,0.0,1.0)

This is not a critical issue for me (as I have ColorBlendModes 😄), but I thought it would be a pain to explain why it is not supported.

Of course, there is the problem that Gray(0.5) ⊙ ARGB(1.0, 1.0, 1.0, 1.0) does not match 0.5 * ARGB(1.0, 1.0, 1.0, 1.0), though.