Autocomplete or hinting for reusable workflows

[Zageron]

Is your feature request related to a problem? Please describe. uses block doesn't have a functioning autocomplete which is frustrating when you have github recognized reusable workflows.

Describe the solution you'd like When cursor is within a uses block, and you request an autocomplete the extension should populate with reusable workflows present in .github/workflows directory.

** Visualization of unhelpfulness **