[FEA] Please expose `int2ip` as a public method

**Is your feature request related to a problem? Please describe.**
The [int2ip](https://github.com/rapidsai/cudf/blob/8d6b2616af8aeec6dfd02d787084c583e2447791/python/cudf/cudf/core/column/numerical.py#L347) method is not exposed publicly. Using it requires calling `Series._column.int2ip()`

Given that methods like `Series.str.ip2int` and `Series.str.isipv4` are public it would be nice to have this as well.

**Describe the solution you'd like**
A public method

**Describe alternatives you've considered**
Continue calling `Series._column.int2ip()`

**Additional context**
This is a nice-to-have and not a critical request.