Added heart rate to Spezi HealthKit

[PSchmiedmayer]

Added heart rate to Spezi HealthKit

♻️ Current situation & Problem

• We didn't collect heart rate.

⚙️ Release Notes

• Added heart rate to Spezi HealthKit

📚 Documentation

• We didn't add any new documentation.

✅ Testing

• No tests added.

📝 Code of Conduct & Contributing Guidelines

By submitting creating this pull request, you agree to follow our Code of Conduct and Contributing Guidelines:

• I agree to follow the Code of Conduct and Contributing Guidelines.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.81%. Comparing base (6a76a15) to head (8c4479c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #2      +/-   ##
==========================================
+ Coverage   86.73%   86.81%   +0.08%     
==========================================
  Files          21       21              
  Lines         693      697       +4     
==========================================
+ Hits          601      605       +4     
  Misses         92       92              

Files with missing lines	Coverage Δ
...eApplication/CS342ExampleApplicationDelegate.swift	93.94% <100.00%> (+0.40%)	⬆️

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