[new]: `array_z_scores(arr)`

[julienawonga]

Check the idea has not already been suggested

• I could not find my idea in existing issues

Edit the title above with self-explanatory function name and argument names

• The function name and the argument names I entered in the title above seems self explanatory to me.

BigFunction Description as it would appear in the documentation

Returns an array of z-scores, which are standardized values showing how many standard deviations each element is from the mean.

Examples of (arguments, expected output) as they would appear in the documentation

• arr=[1, 2, 3, 4, 5] --> [−1.414,−0.707,0,0.707,1.414]

[unytics]

Function has been deployed.

Here is the doc

Thanks for your contribution @julienawonga @AxelThevenot