Re-add data= in zarr.core.array.create_array

[martindurant]

In V2, create_array allowed for passing data=, which was convenient for determining the shape, dtype and initial data of the created data.

arr = create_array(name,  dtype=arr.dtype, shape=arr.dtype)
arr[:] = arr

would simplify to

create_array(name,  data=arr)

[d-v-b]

I don't think create_array existed in v2, but it's true that the v2 array function took an array-like data parameter which would be used to initialize the array.

Given how many people have asked for this feature recently, I wonder if we should rename create_array to init_array, and use the name create_array for a top-level routine that combines array initialization with filling the array with data.

[jhamman]

I don't see any harm in adding the data keyword to the create_array function.