Export and install CMake targets

[dg0yt]

Description

libcbor already installed a cmake config file but it didn't provide linking information. This PR adds canonical export of the library, offering all usage properties via the imported target libcbor::libcbor.

  find_package(libcbor CONFIG REQUIRED)
  target_link_libraries(main PRIVATE libcbor::libcbor)

Checklist

• I have read followed CONTRIBUTING.md
  • I have added tests
  • I have updated the documentation
  • I have updated the CHANGELOG
• Are there any breaking changes?
  • If yes: I have marked them in the CHANGELOG (example)
• Does this PR introduce any platform specific code?
• Security: Does this PR potentially affect security?
• Performance: Does this PR potentially affect performance?

[dg0yt]

A variant of this change is in microsoft/vcpkg#42341. There, the CMake config is consumed by libfido2.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (5369727) to head (04c852c).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #337   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           20        20           
  Lines         1662      1662           
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  Hits          1662      1662           

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[PJK]

Thank you!