feat: refactoring 'event' subcommands

[pixel365]

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Problem

The problem was that all the 'event' subcommands were located in one file 'events.go', which made it very difficult to read the code and add new subcommands if necessary.

Feature

I refactored and separated the 'event' subcommands, which in my opinion made the code noticeably cleaner and easier to understand and make changes in the future. No functionality or behavior is broken.

Description of Changes:

• Refactoring cmd/events.go

Checklist

• [x] My code follows the Contribution Guide
• [x] I have self-reviewed the changes being requested
• [x] I have made comments on pieces of code that may be difficult to understand for other editors
• [x] I have updated the documentation (if applicable)