Manually packaging node modules instead of automatic collection

[itsdouges]

Hello! With the closure of #421 and related issues it doesn't look like Microsoft is keen to support alternate package managers.

As an alternate path forward, we could update vsce pack to be able to package any node_modules folder that is present in the publishing folder. I had quite a hard / frustrating time using pnpm and collecting the relevant monorepo wide dependencies to build a vsce package. I ended up using, amusingly, electron-builder to collect the relevant dependencies (including symlinked ones) and have them ready for packaging. It works, albeit quite insane.

Next problem: Currently vsce pack ignores node_modules. To make it work I've applied this patch which enables node modules to be packaged if present:

diff --git a/out/package.js b/out/package.js
index 0a464f49ad8ff2b481180c65a7eba6376bb3f945..bc6b6f0557d2668e59c5532f46e2ef9b573fe801 100644
--- a/out/package.js
+++ b/out/package.js
@@ -1145,7 +1145,7 @@ const defaultIgnore = [
 const notIgnored = ['!package.json', '!README.md'];
 async function collectAllFiles(cwd, dependencies, dependencyEntryPoints) {
     const deps = await (0, npm_1.getDependencies)(cwd, dependencies, dependencyEntryPoints);
-    const promises = deps.map(dep => (0, util_1.promisify)(glob_1.default)('**', { cwd: dep, nodir: true, dot: true, ignore: 'node_modules/**' }).then(files => files.map(f => path.relative(cwd, path.join(dep, f))).map(f => f.replace(/\\/g, '/'))));
+    const promises = deps.map(dep => (0, util_1.promisify)(glob_1.default)('**', { cwd: dep, nodir: true, dot: true }).then(files => files.map(f => path.relative(cwd, path.join(dep, f))).map(f => f.replace(/\\/g, '/'))));
     return Promise.all(promises).then(util.flatten);
 }
 function getDependenciesOption(options) {

Ideally this could be added as a feature and then guided for the "alternate" package manager path. With links off for how folks can collect their node modules (pnpm publish being another example).