Merge #2991

2991: vscode: updated rollup typescript so it typechecks the bundle r=Veetaha a=Veetaha

See [this happy update](https://github.com/rollup/plugins/blob/master/packages/typescript/CHANGELOG.md#v300) from `@rollup/typescript-plugin` changelog)

I also added a utility script to view the latest dependencies versions (`dry-run` variant) and update them in batch. Beware, that it bumps versions even if the major version of them has changed (for updating only within one major version there is a cli option, but I didn't want add a whole bunch of scripts)
Some of the dependencies major versions are out of date:
```
~/my/projects/rust-analyzer/editors/code (feature/refactoring-vscode-ext) $ npm run bump-deps:dry-run

> [email protected] bump-deps:dry-run /home/veetaha/my/projects/rust-analyzer/editors/code
> npm-check-updates

Checking /home/veetaha/my/projects/rust-analyzer/editors/code/package.json
[====================] 16/16 100%

 jsonc-parser                    ^2.1.0  →   ^2.2.0 
 @rollup/plugin-commonjs        ^11.0.1  →  ^11.0.2 
 @rollup/plugin-node-resolve     ^6.1.0  →   ^7.1.0 
 @types/node                  ^12.12.25  →  ^13.7.0 
 rollup                         ^1.30.1  →  ^1.31.0 
 tslint                         ^5.20.1  →   ^6.0.0 
 vsce                           ^1.71.0  →  ^1.72.0 
```

Co-authored-by: Veetaha <[email protected]>

Author: bors[bot]

editors/code/package-lock.json

@@ -32,7 +32,7 @@
     "devDependencies": {
         "@rollup/plugin-commonjs": "^11.0.1",
         "@rollup/plugin-node-resolve": "^6.1.0",
-        "@rollup/plugin-typescript": "^2.1.0",
+        "@rollup/plugin-typescript": "^3.0.0",
         "@types/node": "^12.12.25",
         "@types/seedrandom": "^2.4.28",
         "@types/vscode": "^1.41.0",