Add keypair generation to IoT device registration

[matt8100]

Closes #3

• Bump package.json nodejs version to current LTS v16
  • Lockfile also updated to v16 npm's version
• Package changes:
  • node-forge for keypair generation
  • rimraf devDependency for cross-platform directory removal when building with npm run build
  • Removed project-name-generator; Device names are generated from their device IDs, and are out of our control, so device name generation not necessary
• Use eslint-config-google rule of single-quotes for strings, extended max-len from 80 to 120
• Split device routes into device.ts file, and use index.ts simply as a router
• Add keypair generation to registerDevice() route