feat: Add derive macro "IntoEvent"

[loloicci]

Description

This PR adds a derive macro IntoEvent to package/std. This macro helps make an event from a structure. When a structure type is defined with IntoEvent, this macro makes a cast function from the structure to Event.
Added code are the same as loloicci#1

Closes #143

Types of changes

• Bug fix (changes which fixes an issue)
• New feature (changes which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• ETC (build, ci, docs, perf, refactor, style, test)

Checklist

• I followed the contributing guidelines.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• The PR title and commits are followed conventional commit form.