lavapipe: Support all Vulkan image sample counts
Currently, the lavapipe frontend only supports VK_SAMPLE_COUNT_4_BIT: https://github.com/Mesa3D/mesa/blob/e4e4ba23047a0f2f2578691456e487fba2013f43/src/gallium/frontends/lavapipe/lvp_formats.c#L248 (and VK_SAMPLE_COUNT_1_BIT)
I'm running tests on Github Actions, and using lavapipe to test my application's Vulkan support. It would be very useful if lavapipe supported all of the Vulkan multisample counts (1, 2, 4, 8, 16, 32): https://registry.khronos.org/vulkan/specs/1.3-extensions/man/html/VkSampleCountFlagBits.html