Export msquic include install dir

[dg0yt]

Description

This PR ensures that the exported CMake target carries the include directories property which is necessary for accessing the installed headers.
The location corresponds to the destination in

msquic/src/bin/CMakeLists.txt

Line 270 in 10f2487

install(FILES ${PUBLIC_HEADERS} DESTINATION include)

Testing

This is backported from the vcpkg port of msquic. In vcpkg, the exported config is consumed by port msh3.

Documentation

No impact AFAICT. CMake usage is not covered at all.

FTR vcpkg's (tested) usage notice is:

msquic provides CMake targets:

  # this is heuristically generated, and may not be correct
  find_package(msquic CONFIG REQUIRED)
  target_link_libraries(main PRIVATE msquic::msquic)

which is pretty much what is expected for Modern CMake. (But the vcpkg port comes with more patches.)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.71%. Comparing base (10f2487) to head (cd126f5).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4725      +/-   ##
==========================================
- Coverage   87.17%   85.71%   -1.47%     
==========================================
  Files          56       56              
  Lines       17363    17363              
==========================================
- Hits        15137    14882     -255     
- Misses       2226     2481     +255     

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