Update code structure to follow the cookiecutter-ntc template

[DistantVoyager]

Environment

• Nautobot version: 1.5.0+
• nautobot-data-validation-engine version: 2.0.0

Proposed Functionality

Update the Data Validation Engine app repository to align with other Nautobot apps. The structure should follow the cookiecutter-ntc template (https://github.com/networktocode-llc/cookiecutter-ntc). This will bring the repo up-to-speed and consistent with other Nautobot apps and more closely follow existing docs.

Use Case

As an engineer wanting to develop for the Nautobot Data Validation Engine app, I want a consistent structure of the app's repo/code and for it to coincide with the development guides, docs, and structure of other Nautobot apps.