GPU Python: Implement gpu.texture.from_image

It can be useful to replace `image.bindcode` and `image.gl_load`.

Used for example in https://docs.blender.org/api/current/gpu.html#d-image

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D10458

doc/python_api/sphinx_doc_gen.py

@@ -253,6 +253,7 @@ else:
         "gpu.select",
         "gpu.shader",
         "gpu.state",
+        "gpu.texture",
         "gpu_extras",
         "idprop.types",
         "mathutils",
@@ -1981,10 +1982,11 @@ def write_rst_importable_modules(basepath):
         "imbuf.types": "Image Buffer Types",
         "gpu": "GPU Shader Module",
         "gpu.types": "GPU Types",
-        "gpu.matrix": "GPU Matrix",
-        "gpu.select": "GPU Select",
-        "gpu.shader": "GPU Shader",
-        "gpu.state": "GPU State",
+        "gpu.matrix": "GPU Matrix Utilities",
+        "gpu.select": "GPU Select Utilities",
+        "gpu.shader": "GPU Shader Utilities",
+        "gpu.state": "GPU State Utilities",
+        "gpu.texture": "GPU Texture Utilities",
         "bmesh": "BMesh Module",
         "bmesh.ops": "BMesh Operators",
         "bmesh.types": "BMesh Types",