Adds binding to FHIRClassProperty

[bwalsh]

This PR:

• Adds binding to FHIRClassProperty - useful for downstream rendering

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.24%. Comparing base (bcef8e7) to head (8b9b19b).
⚠️ Report is 9 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #4      +/-   ##
==========================================
+ Coverage   99.21%   99.24%   +0.02%     
==========================================
  Files           5        5              
  Lines         127      132       +5     
==========================================
+ Hits          126      131       +5     
  Misses          1        1              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[nazrulworld]

Thanks a lot, please update https://github.com/nazrulworld/fhirspec/blob/master/AUTHORS.rst here.