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

npm/from-local-build.js

@@ -0,0 +1,26 @@
+// Copyright 2013 Lovell Fuller and others.
+// SPDX-License-Identifier: Apache-2.0
+
+'use strict';
+
+// Populate contents of a single npm/sharpen-sharp-<build-platform> package
+// with the local/CI build directory for local/CI prebuild testing
+
+const fs = require('node:fs');
+const path = require('node:path');
+
+const { buildPlatformArch } = require('../lib/libvips');
+const platform = buildPlatformArch();
+const dest = path.join(__dirname, platform);
+
+// Use same config as prebuild to copy binary files
+const release = path.join(__dirname, '..', 'build', 'Release');
+const prebuildrc = JSON.parse(fs.readFileSync(path.join(__dirname, '..', '.prebuildrc'), 'utf8'));
+const include = new RegExp(prebuildrc['include-regex'], 'i');
+fs.cpSync(release, path.join(dest, 'lib'), {
+  recursive: true,
+  filter: (file) => {
+    const name = path.basename(file);
+    return name === 'Release' || include.test(name);
+  }
+});