vulkan: add POOL_1D op (llama/25431)

vulkan: add POOL_1D op (llama/25431)

* vulkan : add pool1d push constants and pipeline field

Declared data structures needed for POOL1D OP, which are the vk_op_pool1d_push_constants struct and pipeline_pool1d_f32 field.

* vulkan : add pool1d compute shader

Added pool1d.comp for Vulkan backend mirroring the existing pool2d shader.

* vulkan : add full GGML_OP_POOL_1D support

Added pipeline creation and op dispatch for 1D pooling in the Vulkan backend.

* vulkan : fix pool1d shader logic

Registered pool1d_f32 in vulkan-shaders-gen.cpp and fixed tensor dimension indices and avg pool scale.

* vulkan : fix pool1d end boundary crash and expand test coverage

Fixed an issue where the shader crashed when the end boundary was negative when k0 < p0. Also, added more test cases related to this fix.