Modernize typescript package

[PuruVJ]

TS SDK is currently generated by tsc, which doesn't generate standard module syntax. This is the index.js:

'use strict';
var __createBinding =
	(this && this.__createBinding) ||
	(Object.create
		? function (o, m, k, k2) {
				if (k2 === undefined) k2 = k;
				var desc = Object.getOwnPropertyDescriptor(m, k);
				if (
					!desc ||
					('get' in desc ? !m.__esModule : desc.writable || desc.configurable)
				) {
					desc = {
						enumerable: true,
						get: function () {
							return m[k];
						},
					};
				}
				Object.defineProperty(o, k2, desc);
			}
		: function (o, m, k, k2) {
				if (k2 === undefined) k2 = k;
				o[k2] = m[k];
			});
var __exportStar =
	(this && this.__exportStar) ||
	function (m, exports) {
		for (var p in m)
			if (p !== 'default' && !Object.prototype.hasOwnProperty.call(exports, p))
				__createBinding(exports, m, p);
	};
Object.defineProperty(exports, '__esModule', { value: true });
__exportStar(require('./spacetimedb'), exports);
__exportStar(require('./identity'), exports);
__exportStar(require('./address'), exports);
__exportStar(require('./client_db'), exports);
__exportStar(require('./message_types'), exports);

This isn't standard compliant and more importantly, redundant.

Solution:

Use rollup-based setup to bundle this. We can use https://github.com/egoist/tsup, which uses rollup for bundling(everything in one single JS file rather than multiple), generates d.ts, and sourcemaps all in one go with minimal config. I use it for all my npm packages and can't recommend it enough.