Enhance .joke command with additional joke variations

[Tr-Do]

Motivation:

• The current .joke command supports chuck, neutral, and all. Adding dad jokes increases the variety without disrupting existing functions.
• This serves as the first open-source contribution

Proposal:

• Integrate icanhazdadjoke API, a free API for developers
• Extend .joke command with a new option: .joke dad
• No refactor or dependency required, no change to current logic

[mbaruh]

Fantastic idea, I like it

[mbaruh]

@Tr-Do Would you like to implement it yourself?

[Tr-Do]

Yes. The code has been ready and waiting for approval. Submitting pull request in a few hours