Add hit component and effects; update player and enemy scenes to integrate hit feedback

objects/fxs/hit_particles.tscn

@@ -0,0 +1,40 @@
+[gd_scene load_steps=6 format=3 uid="uid://b12tppjkkqpt4"]
+
+[sub_resource type="Gradient" id="Gradient_qb72p"]
+colors = PackedColorArray(1, 1, 1, 1, 1, 1, 1, 0)
+
+[sub_resource type="GradientTexture1D" id="GradientTexture1D_f1fvy"]
+gradient = SubResource("Gradient_qb72p")
+
+[sub_resource type="Curve" id="Curve_82d6e"]
+_data = [Vector2(0, 1), 0.0, 0.0, 0, 0, Vector2(1, 0), 0.0, 0.0, 0, 0]
+point_count = 2
+
+[sub_resource type="CurveTexture" id="CurveTexture_7b7mt"]
+curve = SubResource("Curve_82d6e")
+
+[sub_resource type="ParticleProcessMaterial" id="ParticleProcessMaterial_p34xd"]
+resource_local_to_scene = true
+lifetime_randomness = 1.0
+particle_flag_disable_z = true
+emission_shape = 1
+emission_sphere_radius = 8.0
+direction = Vector3(0.1, -0.5, 0)
+initial_velocity_min = 200.0
+initial_velocity_max = 400.0
+gravity = Vector3(0, 80, 0)
+damping_min = 400.0
+damping_max = 800.0
+scale_max = 3.0
+scale_curve = SubResource("CurveTexture_7b7mt")
+color_ramp = SubResource("GradientTexture1D_f1fvy")
+
+[node name="HitParticles" type="GPUParticles2D"]
+emitting = false
+amount = 32
+lifetime = 0.6
+one_shot = true
+explosiveness = 1.0
+randomness = 1.0
+fixed_fps = 24
+process_material = SubResource("ParticleProcessMaterial_p34xd")