Update 'development' directory files to align with other Nautobot apps & docs

[DistantVoyager]

Environment

• Nautobot version: 1.5.0+
• nautobot-data-validation-engine version: 1.0.0+

Proposed Functionality

Add and update the files in the 'development' directory to align with other Nautobot apps. An example is https://github.com/nautobot/nautobot-plugin-welcome-wizard/tree/develop/development. This will bring the repo up-to-speed with the developer experience of other Nautobot apps and more closely follow developer docs.

Use Case

As an engineer wanting to develop for the Nautobot Data Validation Engine app, I want a simpler structure of the development files required to setup my dev environment and for them to coincide with the development guides, docs, and other Nautobot apps.

[DistantVoyager]

Closed as this is now encompassed in the larger feature of #43