Compare question feature [enhancement]

[Jordian0]

Is your feature request related to a problem? Please describe.
When users are studying LeetCode problems, they often need to compare different problems to understand their relative difficulty, patterns, and relationships. Currently, users have to manually open multiple tabs and switch between them to compare problems, which is time-consuming and inefficient. This is particularly frustrating when trying to:

• Understand difficulty differences between similar problems
• Compare acceptance rates and topics
• Find related problems for practice

Describe the solution you'd like
Implement a /compare problems command that allows users to compare two LeetCode problems side by side within Discord.

Additional feature
Comparing two users profile.

[github-actions]

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