feat: export types and enums from main module

[lukeocodes]

This PR adds types and enums to the exports of the main module. This allows a user to require types and enums along with the main createClient factory, to use them in client applications.

before:

const { createClient } = require("@deepgram/sdk");
const { LiveTranscriptionEvents } = require("@deepgram/sdk/dist/main/lib/enums");
// or
import { createClient } from "@deepgram/sdk";
import { LiveTranscriptionEvents } from "@deepgram/sdk/dist/main/lib/enums";

after:

const { createClient, LiveTranscriptionEvents } = require("@deepgram/sdk");
// or
import { createClient, LiveTranscriptionEvents } from "@deepgram/sdk";

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