Add window wrapper with validation for get_texture_format() method

[coderabbitai]

Context

This issue tracks the need to add a window wrapper that will handle validation for the GpuWrapper::get_texture_formate() method in sdl_wrapper/sdl_wrapper.gpu.ixx.

Problem

Currently, get_texture_formate() calls SDL_GetGPUSwapchainTextureFormat with m_window, which may be nullptr if set_window() hasn't been called yet. This can cause crashes or return invalid texture formats.

Proposed Solution

Add a window wrapper that will handle the validation check before accessing the swapchain texture format.

References

• Pull Request: Pipeline Wrapper create #7
• Discussion: Pipeline Wrapper create #7 (comment)
• Requested by: @WSQS

Note: There is also a typo in the method name: get_texture_formate() should be get_texture_format().