Feature/secureli 436 language detection

[kevin-orlando]

secureli-436

closes #436

Adds focused language detection during scan for specified or committed files

Changes

• Limiting language detection to a specified set of files during scan (unless all files is provided)
• Adding the usage of git.Repo to check the commit file diff

Testing

• Verify that language detection can be run on either specified or committed files during scan

Clean Code Checklist

• Meets acceptance criteria for issue
• New logic is covered with automated tests
• Appropriate exception handling added
• Thoughtful logging included
• Documentation is updated
• Follow-up work is documented in TODOs
• TODOs have a ticket associated with them
• No commented-out code included