trim() text before splitting it into chunks

[mahovich]

In some cases, this will reduce the number of chunks, and for isomorphic-utils, it will reduce the number of operations.

For example, a text 4097 characters long with whitespace characters at the beginning or end of the text will fit into 1 chunk, not 2 as it does now:

import { EdgeTTS } from 'edge-tts-universal';
import fs from 'fs/promises';

const text__ = '          ' + 'Lorem Ipsum. '.repeat(315); // 10 + 4095 characters

const tts = new EdgeTTS(text);
const result = await tts.synthesize();
const audioBuffer = Buffer.from(await result.audio.arrayBuffer());
await fs.writeFile('output.mp3', audioBuffer);