Creating new method ReadConfigFS which allows users to pass use fs.FS for loading files
#136
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Attempt at implementing #135 .
Quick note: I noticed that with
parseFile, the file is opened before the filetype is validated. This PR pulls out the filetype validation and creates a new functiongetParseFuncwhich will return the appropriate parser function to run (if the filetype is supported).ReadConfigandReadConfigFSthen just keep going with the returned function.Tests were added for both
ReadConfigFSandgetParseFunc.