Compatible with Windows for LibTorch deployment

[shining-love]

• Compatible with Windows environment
• Use LibTorchVision to read images in the LibTorch demo

We've met some issues about decode_image in LibTorchVision

libc++abi: terminating with uncaught exception of type c10::Error: decode_jpeg: torchvision not compiled with libjpeg support
Exception raised from decode_jpeg at /tmp/torchvision-20220127-98534-apsyj/vision-0.11.3/torchvision/csrc/io/image/cpu/decode_jpeg.cpp:10 (most recent call first):
frame #0: c10::detail::torchCheckFail(char const*, char const*, unsigned int, char const*) + 92 (0x10452b0d8 in libc10.dylib)
frame #1: vision::image::decode_png(at::Tensor const&, long long) + 0 (0x1046be46c in libtorchvision.dylib)
frame #2: ReadImage(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) + 72 (0x10425a574 in yolort_torch)
frame #3: main + 2516 (0x10425b164 in yolort_torch)
frame #4: start + 520 (0x1042fd0f4 in dyld)

[1]    77736 abort      ./yolort_torch --checkpoint ../../../notebooks/yolov5n6.torchscript.pt

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #303 (4efda6c) into main (1fea1a6) will not change coverage.
The diff coverage is n/a.

❗ Current head 4efda6c differs from pull request most recent head 93b6114. Consider uploading reports for the commit 93b6114 to get more accurate results

@@           Coverage Diff           @@
##             main     #303   +/-   ##
=======================================
  Coverage   94.93%   94.93%           
=======================================
  Files          11       11           
  Lines         731      731           
=======================================
  Hits          694      694           
  Misses         37       37           

Flag	Coverage Δ
unittests	94.93% <ø> (ø)

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[zhiqwang]

LGTM, Thanks @yang-gis for your contributions to yolort.