Generate a subset of icons as dictionary (source output option)

https://1602.github.io/elm-feather-icons/ to generate a subset of icons as dictionary

The issue references the project's website and suggests generating a subset of icons as a dictionary. Look at the existing icon generation code, likely in a script or build file, to understand how icons are currently produced. Determine how to add an output option that creates a dictionary mapping icon names to their SVG strings. Check if there are existing tests for the generation process to ensure the new output works correctly.

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