Implement ufunc_outer like add.outer for binary Elemwise operations

[Dhruvanshu-Joshi]

Description

Compute the outer product of two vectors.

Given two vectors a and b of length M and N, respectively, the outer product [1]_ is:

  [[a_0*b_0  a_0*b_1 ... a_0*b_{N-1} ]
   [a_1*b_0    .
   [ ...          .
   [a_{M-1}*b_0            a_{M-1}*b_{N-1} ]]

Related Issue

• Closes Implement missing ufunc.outer functions for binary ops #55
• Related to #

Checklist

• Checked that the pre-commit linting/style checks pass
• Included tests that prove the fix is effective or that the new feature works
• Added necessary documentation (docstrings and/or example notebooks)
• If you are a pro: each commit corresponds to a relevant logical change

Type of change

• New feature / enhancement
• Bug fix
• Documentation
• Maintenance
• Other (please specify):

[ricardoV94]

Thanks @Dhruvanshu-Joshi