Add Option to Control Command Target for Offline Players

[666pyke]

This pull request introduces a new configuration option, allow-offline-players-in-commands, that allows server administrators to control whether currency-related commands can be executed on offline players.

• Added the configuration option allow-offline-players-in-commands to config.yml:

allow-offline-players-in-commands: true

Determines if commands should be usable on offline players.

Note: Changes to this setting require a server restart to take effect.

allow-offline-players-in-commands: true

• Updated relevant commands (pay, give, take, etc.) to respect this configuration setting.
  Added checks to prevent issuing currency to players who have never joined the server, improving command reliability.

On servers with a large number of players (e.g., 30,000 to 40,000 offline players), executing currency commands on offline players can lead to significant lag. Allowing administrators to control whether commands can target offline players helps mitigate performance issues and provides more flexibility for managing server resources.

For example, trying to give currency to offline players in such scenarios can cause severe lag: https://prnt.sc/q9LQ8fvvebB9