Add rank configuration loading

[adryanalencar]

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[AzureDoom]

Hi!

Can you give a brief overview of what this is adding exactly?

[AzureDoom]

After looking at this a bit more a few things:

• Ranks should only be enabled with boolean config option here, in which it should be default to false: https://github.com/AzureDoom/LevelingCore/blob/main/src/main/java/com/azuredoom/levelingcore/config/GUIConfig.java
• The msg lang you added will be broken by my next update as I moved those to be lang driven and will need updated for sure. You should add a new lang option with the {rank} parm for it if you want it the chat.
• No default ranks.yml is provided or generated for the user, which only generate when the above config option is enabled, see default.yml for how it should do this.