Upgraded dev dependencies

• @types/node: 13.11.0 -> 18.19.64
• typescript: 4.6.4 -> 5.3.3
• @types/mocha: 9.0.0 -> 10.0.9
• mocha: 9.1.2 -> 10.8.2
• @types/vscode: 1.76.0 -> 1.84.0
• @vscode/codicons: 0.0.29 -> 0.0.36
• esbuild: 0.16.17 -> 0.24.0

Upgraded VS Code engine

• 1.76.0 -> 1.84.0

Removed unused dev dependencies

• ps-node
• @types/vscode-webview => Provides types for webviews , but currently not used anywhere in the code. Types provided: https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/vscode-webview/index.d.ts

Replaced fs.rmdir() to fs.rm()

Deprecation warning of rmdir() was showing up earlier before upgrade of @types/node.

DeprecationWarning: In future versions of Node.js, fs.rmdir(path, { recursive: true }) will be removed. Use fs.rm(path, { recursive: true }) instead

https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/vscode-webview/index.d.ts

So, replaced instances of rmdir with rm.

Updated package-lock.json

Deleted package-lock.json and created again (that's why it's version is changed from 2 to 3) so that it removes all the earlier redundant entries and generates a new file on the basis of updated package.json.