[FEAT] create js client

[edwinkys]

Feature Description

We want to create a JS client library that we are going to officially support. Although not as common as Python, some AI agents are created in JS. This library will allow JS users to build HITL layer with Phantasm.

Potential Solution

We can use protobufjs to compile our proto file to JavaScript code. Just like the Python client, we want to have a single class called Phantasm that will be the entrypoint to the functionality as a client.