fix(metadata): stop fabricating display metadata and add DICOM JSON converter

Replace the hand-built metadata subset in parseMeta with a VR-aware
DICOM-to-DICOM-JSON converter. Window Center/Width, Rescale Intercept/Slope
are only emitted when the source element exists; multi-values are preserved
in source order. VOI/LUT, Presentation LUT and Pixel Padding tags are
preserved and Pixel Data is excluded.

- add src/dimse/dicomJson.ts (dictionary-aware converter)
- rewrite src/dimse/parseMeta.ts to use the converter
- add synthetic non-PHI DICOM writer and metadata tests
- add npm test script (node:test + ts-node) and skipLibCheck

tsconfig.json

@@ -69,6 +69,7 @@
     // "isolatedModules": true,                          /* Ensure that each file can be safely transpiled without relying on other imports. */
     // "allowSyntheticDefaultImports": true,             /* Allow 'import x from y' when a module doesn't have a default export. */
     "esModuleInterop": true,                             /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables `allowSyntheticDefaultImports` for type compatibility. */
+    "skipLibCheck": true,                                /* Skip type checking of declaration files from dependencies. */
     // "preserveSymlinks": true,                         /* Disable resolving symlinks to their realpath. This correlates to the same flag in node. */
     "forceConsistentCasingInFileNames": true,            /* Ensure that casing is correct in imports. */