feat(events): Refactor Functions into Event Handlers

[TomerRon]

This PR implements:

• [x] Remove help command
• [x] Create events namespace and move all event-related logic there
• [x] Rename "function" to "event handler"
• [x] Make handlers no longer required for intialization

---

Breaking changes

• The help command has been removed - it is no longer useful because commands can describe themselves.
• Bot functions can no longer receieve a name and a description.
• BotFunction is now BotEventHandler and is passed to the initialization method as handlers instead of functions

[TomerRon]

:tada: This PR is included in version 3.0.0-beta.6 :tada:

The release is available on:

• npm package (@beta dist-tag)
• GitHub release

Your semantic-release bot :package::rocket:

[TomerRon]

:tada: This PR is included in version 3.0.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: