feat(logs): add logs fetching and streaming

[philnash]

Initial attempt at turning polling for logs into a stream.

There are some bits missing, like passing through some of the filters in the LogsConfig. I can add them, I just wanted someone else to take a look at this and make sure I'm on the right track!

Basic usage

The following will initialise a serverless API client and get a stream of the logs. It will then log every time there are new logs returned from the stream.

const ServerlessAPI = require("@twilio-labs/serverless-api").default;
client = new ServerlessAPI({ accountSid: process.env.TWILIO_ACCOUNT_SID, authToken: process.env.TWILIO_AUTH_TOKEN});
let stream = await client.getLogsStream({ serviceSid: SERVICE_SID, environment: ENVIRONMENT_SID, tail: true })
stream.on('data', json => {
  const log = JSON.parse(json);
  console.log(`[${log.level}][${log.date_created}]: ${log.message}`);
});

Let me know what you think. Companion PR for twilio-run coming soon too.

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