Generate instructions for how to manually run a plugin to debug it
Based on @pandemicsyn's suggestion in #3394 (comment 913447899) it would be useful to do the following:
$ meltano invoke --manual tap-csv
Writing config file: /tmp/manual-tap-csv/tap-csv.json
Writing env file: /tmp/manual-tap-csv/tap-csv.env
To manually execute this plugin run: `source /tmp/manual-tap-csv/tap-csv.env && .meltano/extractors/tap-csv/venv/bin/tap-csv --config /tmp/manual-tap-csv/tap-csv.json`