[RFC]: Add `@stdlib/random/array/invgamma`

[kgryte]

Description

This RFC proposes adding support for creating an array containing pseudorandom numbers drawn from an inverse gamma distribution. This is the array creation analog of @stdlib/random/base/invgamma.

Package: @stdlib/random/array/invgamma
Alias: invgamma

Related Issues

None.

Questions

No.

Other

• A package with a similar implementation/API design is @stdlib/random/array/lognormal.

Checklist

• I have read and understood the Code of Conduct.
• Searched for existing issues and pull requests.
• The issue name begins with RFC:.