Add generic text input prompt and refactor

[chasefleming]

Closes #1526

Description

• Add generic text input
• Refactors run into run method to reduce code usage
• Makes models private except run function

---

For contributor use:

• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels