Adds support for on-device LLMs with SpeziLLMLocal

[vishnuravi]

Adds support for on-device LLMs with SpeziLLMLocal

:recycle: Current situation & Problem

Currently, the app can only use OpenAI models such as GPT-4. However, users may prefer to run an LLM on-device for increased privacy. This is now supported via the SpeziLLMLocal target of the SpeziLLM module and can be enabled in HealthGPT.

:gear: Release Notes

• Adds a step in onboarding for downloading and storing the Llama2 7B model
• Adds an --llmLocal feature flag for toggling local execution
• Adds an onboarding step allowing the user to choose between OpenAI or local execution
• Updates the HealthDataInterpreter to use the local LLM if the flag is set

:books: Documentation

Updated documentation

:white_check_mark: Testing

• Adds UI tests for local LLM configuration during onboarding

Code of Conduct & Contributing Guidelines

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

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 92.66055% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 92.96%. Comparing base (10b725e) to head (97e0d3d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #39      +/-   ##
==========================================
- Coverage   93.03%   92.96%   -0.07%     
==========================================
  Files          24       27       +3     
  Lines         832      922      +90     
==========================================
+ Hits          774      857      +83     
- Misses         58       65       +7     

Files	Coverage Δ
HealthGPT/HealthGPT/HealthDataInterpreter.swift	100.00% <100.00%> (ø)
HealthGPT/HealthGPTAppDelegate.swift	100.00% <100.00%> (ø)
HealthGPT/Onboarding/LLMSource.swift	100.00% <100.00%> (ø)
HealthGPT/Onboarding/LLMSourceSelection.swift	100.00% <100.00%> (ø)
HealthGPT/Onboarding/OpenAIAPIKey.swift	100.00% <100.00%> (ø)
HealthGPTUITests/OnboardingUITests.swift	100.00% <100.00%> (ø)
HealthGPT/HealthGPT/SettingsView.swift	90.81% <83.34%> (+0.45%)	:arrow_up:
HealthGPT/Onboarding/OnboardingFlow.swift	82.61% <87.50%> (+0.26%)	:arrow_up:
HealthGPT/Onboarding/LLMLocalDownload.swift	77.78% <77.78%> (ø)
HealthGPT/HealthGPT/HealthGPTView.swift	93.62% <71.43%> (-3.97%)	:arrow_down:

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[vishnuravi]

The screenshot below shows HealthGPT functioning properly with Llama3 8B.