Add new commands to repl :show import (to show already imported modules) and :show loaded (all available)

[srghma]

• I have read CONTRIBUTING.md.
• I have checked that there is no existing PR/issue about my proposal.

Motivation

will be used in idris-community/idris2-lsp#227

Examples

so, if I have dependencies = base, filepath in ipkg, then :show loaded will show Data.Vect and Data.FilePath and Data.FilePath.File, etc.

just like in purescript

Technical implementation

Alternatives considered

maybe better

1. show imported_modules - modules in scope, e.g. import Data.Vect (same as show import from purescript)
2. show loaded_modules - all available modules from all available packages ( same as show loaded from purescript)
3. show imported_packages - IF before I did :package "filepath" THEN will show filepath - imported completely ELSEIF before I did import Data.Vect THEN will show base - imported partially
4. show loaded_packages - if dependencies = base, filepath then will show base, filepath

Conclusion