[CLI] defog vet metadata

[wongjingping]

Added a new command to our CLI: defog vet metadata <csv_path>
This will check each row and if the character length of the column description exceeds 100, it will send a request to our backend to propose a shortened version.
It will prompt the user with the shortened version to see if the user wants to accept it or not, and will only save it back to the csv if the user agrees (enters 'y').
The user can propose edits on the suggested description.

$ defog vet metadata defog_metadata.csv
Column description for username is > 100 characters.

Old description: Email of the user. Possible values are [email protected], [email protected], [email protected], [email protected], [email protected]

Suggested description: Email of the user. Format: [username]@[domain].com

Do you want to save this description? Enter (Y/n) or your proposed edit: y
Would you like to save the changes back to defog_metadata.csv? Enter 'y' to save or anything else to
 exit without saving:y
Changes saved to defog_metadata.csv

[rishsriv]

Nice, thank you!