Upgrade to Spezi 0.8.0

[Supereg]

Upgrade to Spezi 0.8.0

♻️ Current situation & Problem

This PR upgrades the app to Spezi 0.8.0.

Further, we migrate the app to use the new observation framework.

⚙️ Release Notes

• Upgrade to Spezi 0.8.0
• Migrate to observation
• Consistently use #Preview

📚 Documentation

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✅ Testing

Tests were addresses as required.

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

Merging #42 (bcc4b92) into main (e84b2a5) will decrease coverage by 0.01%.
The diff coverage is 93.94%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #42      +/-   ##
==========================================
- Coverage   85.74%   85.72%   -0.01%     
==========================================
  Files          68       67       -1     
  Lines        2474     2457      -17     
==========================================
- Hits         2121     2106      -15     
+ Misses        353      351       -2     

Files	Coverage Δ
NAMS/Account/AccountSetupHeader.swift	100.00% <ø> (ø)
NAMS/Account/AccountSheet.swift	95.00% <ø> (ø)
NAMS/Bluetooth/BluetoothManager.swift	100.00% <ø> (ø)
NAMS/Contacts/Contacts.swift	91.49% <ø> (ø)
NAMS/EEG/EEGChannelMark.swift	100.00% <ø> (ø)
NAMS/EEG/EEGChart.swift	96.50% <ø> (ø)
NAMS/EEG/EEGDeviceDetails.swift	77.59% <ø> (ø)
NAMS/EEG/EEGDeviceList.swift	100.00% <ø> (ø)
NAMS/EEG/EEGRecording.swift	89.62% <ø> (ø)
NAMS/EEG/ListRow.swift	100.00% <ø> (ø)
... and 20 more

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