Implemented /msg, /tell and /w commands

[KaliemSB]

Description

• Added /msg command.
• Added /tell command.
• Added /w command.

All commands were implemented according to the wiki.

Testing

• Msg command on self, player, players.
• This pull request has been tested and compared against both Vanilla and Paper versions.

Checklist

Things need to be done before this Pull Request can be merged.

• Code is well-formatted and adheres to project style guidelines: cargo fmt
• Code does not produce any clippy warnings cargo clippy

[user622628252416]

Looks good IMO, I just noticed some minor things

[Snowiiii]

You should use Chat Types. They also include a message (e.g. .... whispers to ...).
There are Chat Types parsed from the registry. I think it would be cool to automaticlly/manuelly make an Enum for Chat Types

[KaliemSB]

You should use Chat Types. They also include a message (e.g. .... whispers to ...). There are Chat Types parsed from the registry. I think it would be cool to automaticlly/manuelly make an Enum for Chat Types

I researched and read about these Chat Types, and it seems to be the correct way to send these messages. However, I have no idea how to use or implement it ☠️☠️☠️

[KaliemSB]

Waiting this PR to be merged #324