What's the problem this feature will solve?
Improve the user experience on Powershell command line.

Describe the solution you'd like

I am inspired by the script of click-completion, that you define a function named TabExpansion to implement completion, and backup possible existing functions so that Powershell can fallback one by one to find the correct definition.

I can work on this if there is no objection from maintainers.

Alternative Solutions

Additional context