glthread: add API to allow passing DrawID from glthread to mesa

This will be needed for lowering DrawIndirect in glthread, which is
needed if non-VBO vertex arrays are present.

This only adds the drawid parameter in glthread's draw_arrays and
draw_elements functions, and implements where needed.

New GL API functions are added because we want to use separate
DISPATCH_CMD_* enums for draws with DrawID, so that we don't increase
the memory footprint of draws in glthread batches if drawid == 0.

Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20624>

src/mapi/glapi/gen/gl_API.xml

@@ -12964,6 +12964,14 @@
         <param name="primcount" type="GLsizei"/>
         <param name="basevertex" type="const GLint *" count="primcount"/>
     </function>
+
+    <function name="DrawArraysInstancedBaseInstanceDrawID" es1="1.0" es2="2.0"
+              marshal="custom">
+    </function>
+
+    <function name="DrawElementsInstancedBaseVertexBaseInstanceDrawID"
+              es1="1.0" es2="2.0" marshal="custom">
+    </function>
 </category>
 
 <xi:include href="OES_EGL_image.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>