hd: add include of <chrono> in testHdSortedIds.cpp

[mattyjams]

Description of Change(s)

The code makes use of std::chrono::system_clock, so this adds an include of the header in which that class is declared.

Fixes Issue(s)

This addresses a compilation failure on Windows when using Visual Studio 2022 17.13.1 (MSVC 14.43.34808):

-- Selecting Windows SDK version 10.0.22621.0 to target Windows 10.0.19045.
-- The C compiler identification is MSVC 19.43.34808.0
-- The CXX compiler identification is MSVC 19.43.34808.0
...
-- Check for working C compiler: C:/Program Files/Microsoft Visual Studio/2022/Professional/VC/Tools/MSVC/14.43.34808/bin/Hostx64/x64/cl.exe - skipped
...
-- Check for working CXX compiler: C:/Program Files/Microsoft Visual Studio/2022/Professional/VC/Tools/MSVC/14.43.34808/bin/Hostx64/x64/cl.exe - skipped

...

C:\Users\MattJohnson\Developer\OpenUSD\pxr\imaging\hd\testenv\testHdSortedIds.cpp(50,22): error C2039: 'system_clock': is not a member of 'std::chrono' [D:\OpenUSD_inst\build\OpenUSD\pxr\imaging\hd\testHdSortedIds.vcxproj]
      C:\Program Files\Microsoft Visual Studio\2022\Professional\VC\Tools\MSVC\14.43.34808\include\__msvc_chrono.hpp(286,11):
      see declaration of 'std::chrono'
  
C:\Users\MattJohnson\Developer\OpenUSD\pxr\imaging\hd\testenv\testHdSortedIds.cpp(50,22): error C3083: 'system_clock': the symbol to the left of a '::' must be a type [D:\OpenUSD_inst\build\OpenUSD\pxr\imaging\hd\testHdSortedIds.vcxproj]
C:\Users\MattJohnson\Developer\OpenUSD\pxr\imaging\hd\testenv\testHdSortedIds.cpp(50,36): error C2039: 'now': is not a member of 'std::chrono' [D:\OpenUSD_inst\build\OpenUSD\pxr\imaging\hd\testHdSortedIds.vcxproj]
      C:\Program Files\Microsoft Visual Studio\2022\Professional\VC\Tools\MSVC\14.43.34808\include\__msvc_chrono.hpp(286,11):
      see declaration of 'std::chrono'
  
C:\Users\MattJohnson\Developer\OpenUSD\pxr\imaging\hd\testenv\testHdSortedIds.cpp(50,36): error C3861: 'now': identifier not found [D:\OpenUSD_inst\build\OpenUSD\pxr\imaging\hd\testHdSortedIds.vcxproj]
C:\Users\MattJohnson\Developer\OpenUSD\pxr\imaging\hd\testenv\testHdSortedIds.cpp(49,18): error C2737: 'seed': const object must be initialized [D:\OpenUSD_inst\build\OpenUSD\pxr\imaging\hd\testHdSortedIds.vcxproj]

Checklist

• I have created this PR based on the dev branch

• I have followed the coding conventions

• I have added unit tests that exercise this functionality (Reference:
  testing guidelines)

• I have verified that all unit tests pass with the proposed changes

• I have submitted a signed Contributor License Agreement (Reference:
  Contributor License Agreement instructions)

[jesschimein]

Filed as internal issue #USD-10691

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[jesschimein]

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