Opengl aot support tracking issue

[ailzhang]

related: #5634

We'll use this issue to track progress in opengl aot support.

To give some context, we removed opengl codegen and moved it on top of spirv codegen in #5246 which relieves our burden to maintain multiple codegens. But we haven't migrated or provided a runtime library (like what we did for vulkan backend) to run our android app yet.

After migrating on top of spirv, opengl aot actually can benefit a lot from the common gfx runtime and we just need to complete the following milestones:

• Fix existing buggy opengl aot tests
• Expand python aot tests to cover opengl backend
• Expand cpp aot tests to cover opengl backend
• Run mpm88 desktop demo on top of opengl backend (https://github.com/ailzhang/taichi-aot-demo/tree/gl_demo/mpm88_gl)
• Make sure use_gles is properly handled
• and run implicit_fem android demo

And ofc, we will fix whatever pops up when we try to accomplish the milestones above ;)