feat: [GH-795] Confession Attachments

[beanbeanjuice]

Pull Request

---

Description

Adds the ability to either add attachments to a confession, or send a DM to cafeBot and use those as confessions instead.

Fixes GH-795.

---

Type of Change

• Bug Fix (Small Non-Code Breaking Issue)
• Bug Fix (Critical Code Breaking Issue)
• Feature (Something New Added to the Code)
• Improvement (Improving An Existing Section of Code)
• Documentation Update
• Security Vulnerability

Changes

• Internal Code
• Documentation
• Other: _____

---

Test Configuration

• Hardware:
  • CPU: AMD Ryzen 7 5800x3D
  • GPU: Nvidia RTX 3080
  • RAM: 32 GB DDR4 @ 3600 Mhz
• JDK: Java OpenJDK 21
• Platform: Windows 11

---

Checklist

• The code follows the style guidelines.
• A self-review of the code was performed on GitHub.
• Appropriate comments and javadocs were added in your code.
• Appropriate tests were added.
• Appropriate changes have been made to the documentation.
• Appropriate changes have been made to the README.md file.