GPU: Refactor API for Clearing Storage Buffers.

The previous API for clearing storage buffers was extracted from OpenGL.
OpenGL has many options to support for data conversions, striding and
sizzling. Metal and Vulkan don't have this inside the API and we have to
deal it ourselves.

Blender internally only uses a tiny subset for what is possible in OpenGL.
making the current API to difficult to implement on our future platforms
as we had to implement all cases, most even not used at all.

By changing the API we make future development easier as we only need to
implement what we are actually using.

*New API*

`GPU_storagebuf_clear_int(GPUStorageBuf* ssbo, int32_t* clear_data,
                          uint8_t clear_data_len);`
`GPU_storagebuf_clear_uint(GPUStorageBuf* ssbo, uint32_t* clear_data,
                           uint8_t clear_data_len);`

Related issue: #105492

@@ -234,3 +234,3 @@
   tiles_tx_.acquire(tiles_extent, GPU_RGBA16F);
 
-  GPU_storagebuf_clear_to_zero(tile_indirection_buf_);
+  tile_indirection_buf_.clear_to_zero();

@@ -835,3 +835,3 @@
     union {
       ShadowTileMapClip clip;
-      int4 i;
+      uint4 i;

@@ -48,0 +47,4 @@
+ *
+ * NOTE: clear_data_len must be in range 1 to 4 (inclusive).
+ */
+void GPU_storagebuf_clear_uint(GPUStorageBuf *ssbo, uint32_t *clear_data, uint8_t clear_data_len);

@@ -124,2 +124,4 @@
   }
 
+  GLenum internal_format = GL_R32UI;
+  GLenum format = GL_RED;