Handle proper escaping of backslashes to preserve source data

[smgallo]

Handle proper escaping of backslashes to preserve source data

Description

Source data containing backslashes must be properly escaped to preserve the backslashes.

Motivation and Context

See #52

Tests performed

Tested using SimpleDatabaseIngestor with the following source data and verified that backslashes were not preserved prior to but were after the patch.

'\', '\\', '\\n\\'

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project as found in the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.