Provide convenient APIs for piping between child processes

[alexrp]

It should be easy to pipe from one child process to another, as well as to/from files, streams, collections, etc.

Overloaded operators such as |, >, and < should be provided to easily achieve shell-like piping semantics.

[alexrp]

We should definitely take inspiration from MedallionShell for this: https://github.com/madelson/MedallionShell/blob/e45f1f6ffd4cde752bc21753c476a6f7cac0f01d/MedallionShell/Command.cs