Enhance OpenGLCommandList with comprehensive rendering API
- Add ClearFlags, ClearColor, ClearDepth, ClearStencil, ClearDepthStencil
- Add SetVertexBuffers (multiple buffers)
- Add SetIndexBuffer with offset
- Add BindVertexArray with index buffer
- Add SetViewport with depth range, SetViewports
- Add SetScissor, SetScissorRects, EnableScissorTest
- Add depth test/write/func methods
- Add stencil test methods
- Add blending methods (enable, blend func, equation, color)
- Add culling methods (enable, cull face, front face, polygon mode)
- Add instanced drawing (DrawInstanced, DrawIndexedInstanced)
- Add indirect drawing (DrawIndirect, DrawIndexedIndirect)
- Add MultiDrawArrays, MultiDrawElements
- Add Dispatch and Compute Shader support
- Add MemoryBarrier and TextureBarrier
- Add texture/sampler binding methods
- Add buffer binding (BindBufferBase, BindBufferRange)
- Add Enable/Disable for OpenGL caps
- Add uniform setting methods
- Add query methods
- Add ReadPixels, BlitFramebuffer, CopyImageSubData
- Add framebuffer invalidation
- Add debug group push/pop
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