Started implementing jar-based(plugin) tool loading

Core#plugin:
- Plugin.java: Main framework for plugins
- OllamaTool.java: Used for annotation based loading of tools
- InjectPlugin.java: Annoataion for injecting the Plugin instance, used when annotation based loading is used
- PluginMetadata.java: metadata of the plugin, a class-reflection of plugin.json file within each plugin
- PluginLoadingException.java: Exception thrown when an error happens durring plugin loading

.idea/gradle.xml

@@ -13,6 +13,7 @@
             <option value="$PROJECT_DIR$/Core" />
             <option value="$PROJECT_DIR$/Display" />
             <option value="$PROJECT_DIR$/MALAPITool" />
+            <option value="$PROJECT_DIR$/Plugin" />
             <option value="$PROJECT_DIR$/launcher" />
           </set>
         </option>