vulkan: add LOG operation support for F32 and F16

[zayac]

Summary

Implements LOG operation for the Vulkan backend with F32 and F16 support.

Part of #14909.

Testing

./build/bin/test-backend-ops -o LOG
ggml_vulkan: Found 1 Vulkan devices:
ggml_vulkan: 0 = NVIDIA GeForce RTX 5070 (NVIDIA) | uma: 0 | fp16: 1 | bf16: 1 | warp size: 32 | shared memory: 49152 | int dot: 1 | matrix cores: NV_coopmat2
Testing 2 devices

Backend 1/2: Vulkan0
  Device description: NVIDIA GeForce RTX 5070
  Device memory: 12227 MB (10998 MB free)

  LOG(type=f16,ne=[10,5,4,3]): OK
  LOG(type=f16,ne=[7,1,5,3]): OK
  LOG(type=f32,ne=[10,5,4,3]): OK
  LOG(type=f32,ne=[7,1,5,3]): OK
  4/4 tests passed
  Backend Vulkan0: OK
Backend 2/2: CPU
  Skipping CPU backend
2/2 backends passed
OK

[jeffbolznv]

This should check that src and dst types match.

[jeffbolznv]

Remove this line, not all devices support it and it shouldn't be needed.

[jeffbolznv]

Suggest using FLOAT_TYPE rather than float.

[jeffbolznv]

Suggested change

	string_to_spv("log_f16", "log.comp", {{"A_TYPE", "float16_t"}, {"D_TYPE", "float16_t"}, {"FLOAT_TYPE", "float16_t"}});
	string_to_spv("log_f16", "log.comp", {{"A_TYPE", "float16_t"}, {"D_TYPE", "float16_t"}, {"FLOAT_TYPE", "float16"}});