Distribute prebuilt binaries via the npm registry #3750

- Remove all custom download logic for prebuilt binaries
- Add scripts to populate package contents
- Specify minimum versions of common package managers
- Remove sharp.vendor runtime API as no-longer relevant
- Update installation docs and issue templates

.prebuildrc

@@ -1,6 +1,6 @@
 {
   "runtime": "napi",
-  "include-regex": "(sharp-.+\\.node|libvips-cpp\\.dll)",
+  "include-regex": "(sharp-.+\\.node|libvips-.+\\.dll|libglib-.+\\.dll|libgobject-.+\\.dll)",
   "prerelease": true,
   "strip": true
 }