Read Sqlite databases for credentials

[ankushgoel27]

gcloud stores GCP credentials in .db format which is the sqlite format. Currently, trufflehog doesn't detect valid GCP credentials from the .db file.

There is already an issue open in the main fork. I would appreciate if you can work on it to fix it and read the files reliably to detect any credentials inside sqlite files.

[rgmz]

Related to: trufflesecurity#2095 and trufflesecurity#3056