feat(plugin): add terrain3d plugin installation

demo/assets/textures/asset_licenses.txt

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+All ambientCG assets are provided under the
+Creative Commons CC0 1.0 Universal License.
+https://docs.ambientcg.com/license/
+
+Grass:
+https://ambientcg.com/view?id=Ground037
+
+Rock:
+https://ambientcg.com/view?id=Rock030
+
+Cliff:
+https://ambientcg.com/view?id=Rock023

demo/assets/textures/ground037_alb_ht.png.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://ddprscrpsofah"
+path.bptc="res://.godot/imported/ground037_alb_ht.png-d854c3c88beba9927351b95063edffa2.bptc.ctex"
+metadata={
+"imported_formats": ["s3tc_bptc"],
+"vram_texture": true
+}
+
+[deps]
+
+source_file="res://demo/assets/textures/ground037_alb_ht.png"
+dest_files=["res://.godot/imported/ground037_alb_ht.png-d854c3c88beba9927351b95063edffa2.bptc.ctex"]
+
+[params]
+
+compress/mode=2
+compress/high_quality=true
+compress/lossy_quality=0.7
+compress/uastc_level=0
+compress/rdo_quality_loss=0.0
+compress/hdr_compression=1
+compress/normal_map=2
+compress/channel_pack=0
+mipmaps/generate=true
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/channel_remap/red=0
+process/channel_remap/green=1
+process/channel_remap/blue=2
+process/channel_remap/alpha=3
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

demo/assets/textures/ground037_nrm_rgh.png.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://c1ots7w6i0i1q"
+path.bptc="res://.godot/imported/ground037_nrm_rgh.png-02372c72ee87f1844ee708d952e43e96.bptc.ctex"
+metadata={
+"imported_formats": ["s3tc_bptc"],
+"vram_texture": true
+}
+
+[deps]
+
+source_file="res://demo/assets/textures/ground037_nrm_rgh.png"
+dest_files=["res://.godot/imported/ground037_nrm_rgh.png-02372c72ee87f1844ee708d952e43e96.bptc.ctex"]
+
+[params]
+
+compress/mode=2
+compress/high_quality=true
+compress/lossy_quality=0.7
+compress/uastc_level=0
+compress/rdo_quality_loss=0.0
+compress/hdr_compression=1
+compress/normal_map=2
+compress/channel_pack=0
+mipmaps/generate=true
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/channel_remap/red=0
+process/channel_remap/green=1
+process/channel_remap/blue=2
+process/channel_remap/alpha=3
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

demo/assets/textures/rock023_alb_ht.png.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://c88j3oj0lf6om"
+path.bptc="res://.godot/imported/rock023_alb_ht.png-9c06b8a5f11d940d1c46d8928f6d6a5c.bptc.ctex"
+metadata={
+"imported_formats": ["s3tc_bptc"],
+"vram_texture": true
+}
+
+[deps]
+
+source_file="res://demo/assets/textures/rock023_alb_ht.png"
+dest_files=["res://.godot/imported/rock023_alb_ht.png-9c06b8a5f11d940d1c46d8928f6d6a5c.bptc.ctex"]
+
+[params]
+
+compress/mode=2
+compress/high_quality=true
+compress/lossy_quality=0.7
+compress/uastc_level=0
+compress/rdo_quality_loss=0.0
+compress/hdr_compression=1
+compress/normal_map=2
+compress/channel_pack=0
+mipmaps/generate=true
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/channel_remap/red=0
+process/channel_remap/green=1
+process/channel_remap/blue=2
+process/channel_remap/alpha=3
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=0

demo/assets/textures/rock023_nrm_rgh.png.import

@@ -0,0 +1,41 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://c307hdmos4gtm"
+path.bptc="res://.godot/imported/rock023_nrm_rgh.png-dd524905a15817dac8149681cddc8975.bptc.ctex"
+metadata={
+"imported_formats": ["s3tc_bptc"],
+"vram_texture": true
+}
+
+[deps]
+
+source_file="res://demo/assets/textures/rock023_nrm_rgh.png"
+dest_files=["res://.godot/imported/rock023_nrm_rgh.png-dd524905a15817dac8149681cddc8975.bptc.ctex"]
+
+[params]
+
+compress/mode=2
+compress/high_quality=true
+compress/lossy_quality=0.7
+compress/uastc_level=0
+compress/rdo_quality_loss=0.0
+compress/hdr_compression=1
+compress/normal_map=2
+compress/channel_pack=0
+mipmaps/generate=true
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/channel_remap/red=0
+process/channel_remap/green=1
+process/channel_remap/blue=2
+process/channel_remap/alpha=3
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=0