Fix and improve --usage flag for ESVs and Scripts #442
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This PR fixes the --usage flag for esv and script list commands. Additionally, it improves the --usage flag to not only tell whether a script/esv is being used, but also how many times it is used.
The --usage flag was also added to esv describe commands. Additionally, the describe command was implemented for scripts so it could also use the --usage flag as well. The --usage flag differs for describe commands as it details where all locations of the usages are, whereas the list commands only detail the first location if one exists.