feat: add appointment validate

[miguelquintas]

https://canvasmedical.atlassian.net/browse/KOALA-4193

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.47%. Comparing base (07b3cae) to head (b835bfe).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1548   +/-   ##
=======================================
  Coverage   93.47%   93.47%           
=======================================
  Files         484      484           
  Lines       21728    21729    +1     
  Branches     1008     1008           
=======================================
+ Hits        20311    20312    +1     
  Misses       1266     1266           
  Partials      151      151           

Flag	Coverage Δ
plugin-abnormal_lab_task_notification	100.00% <ø> (ø)
plugin-api_samples	33.33% <ø> (ø)
plugin-appointment_coverage_label	100.00% <ø> (ø)
plugin-coverage_metadata_sync	100.00% <ø> (ø)
plugin-my_first_plugin	100.00% <ø> (ø)
plugin-patient_summary_chart_groups	100.00% <ø> (ø)
plugin-preact_hello_world	100.00% <ø> (ø)
plugin-send_all_prescriptions	100.00% <ø> (ø)
plugin-simple_note_button_plugin	100.00% <ø> (ø)
plugin-supervising_provider_prescribe	100.00% <ø> (ø)
plugin-supervising_provider_prescribe_protocol	100.00% <ø> (ø)
plugin-upsert_patient_metadata	100.00% <ø> (ø)
plugin-vitals_visualizer_plugin	98.43% <ø> (ø)
py3.11	93.50% <ø> (-0.01%)	⬇️
py3.12	93.50% <ø> (-0.01%)	⬇️
sdk-core	93.50% <ø> (-0.01%)	⬇️

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