Added EonModule class and loading logic into EonCore

Walkthrough

The code changes introduce a modular architecture for the EonCore plugin by implementing an abstract EonModule class and transitioning the EonCore class to extend JavaPlugin. Additional modifications include the addition of a new dependency for the Reflections library, adjustments to event handling, and reorganization of package structures. These changes enhance the plugin's scalability and maintainability.

Changes

Files	Change Summary
`pom.xml`	Added dependency for `reflections` library (version `0.10.2`).
`src/main/java/com/eonnations/eoncore/EonCore.java`	Changed base class from `EonPlugin` to `JavaPlugin`; introduced module management methods.
`src/main/java/com/eonnations/eoncore/common/EonModule.java`	Changed from concrete class to abstract class; added lifecycle methods and a constructor.
`src/main/java/com/eonnations/eoncore/common/database/sql/Credentials.java`	Updated method parameter type from `EonPlugin` to `EonCore`.
`src/main/java/com/eonnations/eoncore/messaging/EonPrefix.java`	Replaced enum constant `NATIONS` with `ISLANDS`.
`src/main/java/com/eonnations/eoncore/messaging/Messaging.java`	Updated `sendNullMessage` method to use `EonPrefix.ISLANDS`.
`src/main/java/com/eonnations/eoncore/node/Node.java`	Changed imports for `FloatingItem` and `Hologram` classes to a new package.
`src/main/java/com/eonnations/eoncore/node/NodeModule.java`	Introduced `NodeModule` class extending `EonModule`.
`src/main/java/com/eonnations/eoncore/node/holograms/FloatingItem.java`	Changed package declaration to `com.eonnations.eoncore.node.holograms`.
`src/main/java/com/eonnations/eoncore/node/holograms/Hologram.java`	Changed package declaration to `com.eonnations.eoncore.node.holograms`.
`src/main/resources/prefixes.json`	Updated JSON key from `"nations"` to `"islands"` while keeping the value unchanged.
`src/test/java/holograms/TestFloatingItem.java`	Updated import for `FloatingItem` to the new package.
`src/test/java/holograms/TestHologram.java`	Updated import for `Hologram` to the new package.

Assessment against linked issues

Objective	Addressed	Explanation
Implement EonModule (#128)	✅

🐰 In the realm of code, where changes flow,
New modules arise, with a vibrant glow.
From nations to islands, the prefixes now sing,
A plugin reborn, like springtime's first fling.
With reflections to guide us, our paths intertwine,
In the world of Eon, our code will shine! 🌟

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Eon-Nations / EonCore