Incremental DICOM loading

[floryst]

This PR updates VolView to support incremental DICOM loading. This is a pretty big change, so I hope to improve this issue description with details of how this is broken down.

Components:

• streaming DICOM parser
• incrementally-loaded image support (done, but final integration depends on a dependency)
  • Depends on VolumeMapper & OpenGLTexture: support updating image regions vtk-js#3077
• update state file schema
• DICOMWeb streaming integration
• fixing various other parts of VolView for perf and integration purposes
• cleanup remaining code TODOs

[netlify]

✅ Deploy Preview for volview-dev ready!

Name	Link
🔨 Latest commit	95aaa94
🔍 Latest deploy log	https://app.netlify.com/sites/volview-dev/deploys/67ffc13befda1500089bd3fb
😎 Deploy Preview	https://deploy-preview-606--volview-dev.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[floryst]

There is an error loading a volview.zip with sample data.

1. Load prostate
2. Save volview.zip
3. Refresh
4. Load volview.zip

Error:

loggers.ts:13 Error: Could not find the parent of an archive source
at deserialize (restoreStateFile.ts:214:17)
at rebuildDataSources (restoreStateFile.ts:261:22)
at async restoreDatasets (restoreStateFile.ts:321:39)
at async restoreStateFile (restoreStateFile.ts:373:30)
at async evaluateChain (evaluateChain.ts:18:22)
at async importDataSources (importDataSources.ts:144:38)
at async load (loadUserFiles.ts:236:18)
at async wrapper (loadUserFiles.ts:289:9)

I just pushed 6e75e97, which addresses this issue.