Added StaliniumCharge effect and integrated it with sword.

- Created `StaliniumChargeEffect` with speed/knockback buffs.
- Registered `ModEffects` and `StaliniumChargeEffect`.
- Updated `StaliniumSwordItem` to apply the custom effect and added cooldown handling.
- Simplified effect logic, replacing vanilla effects with the custom one.
- Ensured sword remains unbreakable.

src/main/java/net/krituximon/stalinium/effect/StaliniumChargeEffect.java

@@ -0,0 +1,26 @@
+package net.krituximon.stalinium.effect;
+
+import net.krituximon.stalinium.Stalinium;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.world.effect.MobEffect;
+import net.minecraft.world.effect.MobEffectCategory;
+import net.minecraft.world.entity.ai.attributes.AttributeModifier;
+import net.minecraft.world.entity.ai.attributes.Attributes;
+
+public class StaliniumChargeEffect extends MobEffect {
+    public StaliniumChargeEffect() {
+        super(MobEffectCategory.BENEFICIAL, 0xAAAAFF);
+        this.addAttributeModifier(
+                Attributes.MOVEMENT_SPEED,
+                ResourceLocation.fromNamespaceAndPath(Stalinium.MODID, "stalinium_charge_speed"),
+                0.2,
+                AttributeModifier.Operation.ADD_MULTIPLIED_BASE
+        );
+        this.addAttributeModifier(
+                Attributes.KNOCKBACK_RESISTANCE,
+                ResourceLocation.fromNamespaceAndPath(Stalinium.MODID, "stalinium_charge_knockback"),
+                0.5,
+                AttributeModifier.Operation.ADD_VALUE
+        );
+    }
+}