Allow terminal output and JSON file output simultaniously

[ElvenSpellmaker]

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Is your feature request related to a problem? Please describe. Currently it's not possible to output to a JSON file, and also to the terminal in the normal format.

Describe the solution you'd like When running Trufflehog in a Pipeline we'd like the main output of Trufflehog to be written to the build log, but also a JSON file to save as an artefact. E.g. trufflehog git file:///${CI_PROJECT_DIR} --json trufflehog-report.json --concurrency=4

Describe alternatives you've considered Currently we run the command twice, which isn't very efficient, once with --json and once without.