Add example GAS project using Node.js(ts-node)

[mahaker]

Please make an example project of a GAS project using esbuild and Node.js(ts-node).
Make sure this function works properly.

The requirements are considered below.

• The project dir is examples/ts-node
• Create index.ts and lib.ts
  • At lib.ts, export one or more functions
  • At index.ts, import function from lib.ts and add one or more functions to global object.
• Create build.ts
  • Include esbuild bundle settings.

If you open a PR and add a star, I'll give you the hacktoberfest-accepted label!
Happy hacking!

[ThePlenkov]

Examples would be nice - I had to read what webpack plugin does to understand how to use this one. But seems like it's working =)