Retry is disabled by default for `POST` method

Describe the bug
Retries are disabled by default for the POST method. We used a config similar to the one below, intending to have 3 retries:

gotEmitter(
  process.env.SNOWPLOW_ENDPOINT, // endpoint
  'https',
  undefined, // port
  'post', // method
  1, // buffer size
  3, // retries
);

However, Snowplow events were not retried on failure due to the Got defaults:

By default, Got does not retry on POST.

To Reproduce
Configure Snowplow with 'post' method and retries >= 1.

Expected behavior
If Snowplow is configured with a positive number of retries, then emit should be retried on network error.

Suggested solution
By default, enable retries for GET and POST methods in gotEmitter.

If the retry argument is a number (instead of an object), then the following object is passed to Got:

const retries: Partial<RequiredRetryOptions> = {
  limit: retry,
  methods: ['GET', 'POST'],
};

Otherwise, if the retry.methods is undefined it should default to be enabled for both methods used by Snowplow:

const retries: Partial<RequiredRetryOptions> = {
  methods: ['GET', 'POST'],
  ...retry,
};

Desktop (please complete the following information):

• OS: Linux
• Node: v20.11.0

Additional context
@snowplow/node-tracker version 3.19.0

Start with trackers/node-tracker/src/got_emitter.ts and reproduce the configuration using the POST method with retries set to 3. Verify that network failures retry for POST, while an explicitly supplied retry.methods configuration remains respected; done means the reported configuration retries as expected.