feat(plugin): add terrain3d plugin installation

demo/assets/materials/M_crystal_blue.tres

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+[gd_resource type="StandardMaterial3D" load_steps=2 format=3 uid="uid://fkhkir6t1hml"]
+
+[ext_resource type="Texture2D" uid="uid://c307hdmos4gtm" path="res://demo/assets/textures/rock023_nrm_rgh.png" id="2_3is54"]
+
+[resource]
+transparency = 1
+vertex_color_use_as_albedo = true
+albedo_color = Color(0.4, 1, 1, 0.647059)
+metallic_specular = 1.0
+roughness = 0.2
+roughness_texture = ExtResource("2_3is54")
+roughness_texture_channel = 3
+emission_enabled = true
+emission = Color(0, 0.145098, 0.776471, 1)
+emission_energy_multiplier = 1.4
+normal_enabled = true
+normal_scale = 0.4
+normal_texture = ExtResource("2_3is54")
+rim_enabled = true
+rim = 0.25
+clearcoat_roughness = 0.0
+ao_light_affect = 1.0
+ao_texture_channel = 3
+refraction_enabled = true
+refraction_scale = -0.1

demo/assets/materials/M_crystal_purple.tres

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+[gd_resource type="StandardMaterial3D" load_steps=2 format=3 uid="uid://cso4f2iyuxpmc"]
+
+[ext_resource type="Texture2D" uid="uid://c307hdmos4gtm" path="res://demo/assets/textures/rock023_nrm_rgh.png" id="2_1t610"]
+
+[resource]
+transparency = 1
+vertex_color_use_as_albedo = true
+albedo_color = Color(0.4, 0.4, 1, 0.556863)
+metallic_specular = 1.0
+roughness = 0.2
+roughness_texture = ExtResource("2_1t610")
+roughness_texture_channel = 3
+emission_enabled = true
+emission = Color(0.235294, 0.145098, 0.776471, 1)
+normal_enabled = true
+normal_scale = 0.4
+normal_texture = ExtResource("2_1t610")
+rim_enabled = true
+rim = 0.25
+clearcoat_roughness = 0.0
+ao_light_affect = 1.0
+ao_texture_channel = 3
+refraction_enabled = true
+refraction_scale = -0.1

demo/assets/materials/M_crystal_red.tres

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+[gd_resource type="StandardMaterial3D" load_steps=2 format=3 uid="uid://ickkffutwcvo"]
+
+[ext_resource type="Texture2D" uid="uid://c307hdmos4gtm" path="res://demo/assets/textures/rock023_nrm_rgh.png" id="2_k2yhv"]
+
+[resource]
+transparency = 1
+albedo_color = Color(0.670588, 0.0588235, 0.384314, 0.509804)
+metallic_specular = 1.0
+roughness = 0.2
+roughness_texture = ExtResource("2_k2yhv")
+roughness_texture_channel = 3
+emission_enabled = true
+emission = Color(0.258824, 0.0823529, 0.25098, 1)
+normal_enabled = true
+normal_scale = 0.4
+normal_texture = ExtResource("2_k2yhv")
+rim_enabled = true
+rim = 0.25
+clearcoat_roughness = 0.0
+ao_enabled = true
+ao_light_affect = 1.0
+ao_texture_channel = 3
+refraction_enabled = true
+refraction_scale = -0.1

demo/assets/materials/M_rock23_black_tp.tres

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+[gd_resource type="StandardMaterial3D" load_steps=3 format=3 uid="uid://d0hyi5n6ng25w"]
+
+[ext_resource type="Texture2D" uid="uid://c88j3oj0lf6om" path="res://demo/assets/textures/rock023_alb_ht.png" id="1_1js8i"]
+[ext_resource type="Texture2D" uid="uid://c307hdmos4gtm" path="res://demo/assets/textures/rock023_nrm_rgh.png" id="2_snl3x"]
+
+[resource]
+albedo_color = Color(0.501406, 0.501407, 0.501406, 1)
+albedo_texture = ExtResource("1_1js8i")
+roughness = 0.95
+roughness_texture = ExtResource("2_snl3x")
+roughness_texture_channel = 3
+normal_enabled = true
+normal_texture = ExtResource("2_snl3x")
+uv1_scale = Vector3(0.4, 0.4, 0.4)
+uv1_triplanar = true
+uv1_world_triplanar = true
+texture_filter = 5

demo/assets/materials/M_rock23_tp.tres

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+[gd_resource type="StandardMaterial3D" load_steps=3 format=3 uid="uid://nbbdrx8vma80"]
+
+[ext_resource type="Texture2D" uid="uid://c88j3oj0lf6om" path="res://demo/assets/textures/rock023_alb_ht.png" id="1_mek0c"]
+[ext_resource type="Texture2D" uid="uid://c307hdmos4gtm" path="res://demo/assets/textures/rock023_nrm_rgh.png" id="2_pp13c"]
+
+[resource]
+vertex_color_use_as_albedo = true
+albedo_color = Color(0.83, 0.83, 0.83, 1)
+albedo_texture = ExtResource("1_mek0c")
+normal_enabled = true
+normal_texture = ExtResource("2_pp13c")
+uv1_scale = Vector3(0.02, 0.02, 0.02)
+uv1_triplanar = true
+uv1_triplanar_sharpness = 6.06286
+uv1_world_triplanar = true
+texture_filter = 5