API iteration

[igalshilman]

This PR changes the following concepts:

1. Adds a client suffix for the ctx.service / ctx.object
2. simply the endpoint binding methods to a single endpoint.bind()
3. make the handlers/objects creation more explicit.

Here is a creation/binding example:

const service = restate.service({
  name: "greeter",
  handlers: {
        greet: ..
  }
});    

export type Greeter = typeof service;

restate.endpoint().bind(service).listen()

And here is a call site:

import type {Greeter} from "...";

const Greeter: Greeter = { name : "greeter" };
...
await ctx.serviceClient(Greeter).greet();
...

Thanks @nikrooz and @gvdongen for the feedback!

[slinkydeveloper]

This looks great!

[igalshilman]

Note: the e2e are not expected to pass, as the API has changed.

[nikrooz]

thanks, looks great!