[request] Add mongodb connection string detector

[bugbaba]

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Description

Hello Team :)

Currently the truffleHog is not having any detector for mongodb connection string, The URI detector https://github.com/trufflesecurity/trufflehog/blob/main/pkg/detectors/uri/uri.go regex is at times able to detect some cases, But not all of them.

Problem to be Addressed

mongodb connection string not detected by trufflehog.

Description of the Preferred Solution

Add a detector to detect mongodb connection string in the code.

You can use https://github.com/bugbaba/tempTrufflehogdebug repo for testing the regex it has both mongodb:// and mongodb+srv:// schema/protocol strings.

Additional Context

Official mongodb documentation: https://www.mongodb.com/docs/manual/reference/connection-string/

Also GitGuardian one of the vendors in this space is able to detect the same.