[Vulkan] Add convert_qconv2d_context op (#97714)
Summary:
This diffs adds a convert_qconv2d_context op, which converts a cpu quantized Conv2dPackedParamsBase object (used by quantized::conv2d) into a vulkan Conv2dPackedContext object.
This op is used in a later diff (D44189363), to do a graph rewrite of quantized conv2d and conv2d_relu ops
Test Plan:
On Mac
```
cd ~/fbsource
buck1 run -c pt.vulkan_full_precision=1 //xplat/caffe2:pt_vulkan_quantized_api_test_binAppleMac\#macosx-arm64
```
On Android
```
cd ~/fbsource
buck1 build -c ndk.custom_libcxx=false -c pt.enable_qpl=0 -c pt.vulkan_full_precision=1 //xplat/caffe2:pt_vulkan_quantized_api_test_binAndroid\#android-arm64 --show-output
adb push buck-out/gen/xplat/caffe2/pt_vulkan_quantized_api_test_binAndroid\#android-arm64 /data/local/tmp/vulkan_quantized_api_test
adb shell "/data/local/tmp/vulkan_quantized_api_test"
```
Reviewed By: SS-JIA
Differential Revision: D41595032
Pull Request resolved: https://github.com/pytorch/pytorch/pull/97714
Approved by: https://github.com/SS-JIA
