feat(amqp/connection.ts): add publishOptions to RequestOptions; use them in AmqpConnection.request

[davidmwhynot]

Added a new property named "publishOptions" to the RequestOptions interface so that the additional
options available in the amqplib's Options.Publish interface can be provided when making rpc
requests. Added said usage of the new property to the AmqpConnection.request method's call to
this.publish.

re #719

[davidmwhynot]

This could also have been done like so:

export interface RequestOptions extends Omit<Options.Publish, 'replyTo'> {
  exchange: string;
  routingKey: string;
  timeout?: number;
  payload?: any;
}

// usage in AmqpConnection.request:
await this.publish(
  requestOptions.exchange,
  requestOptions.routingKey,
  payload,
  {
    ...requestOptions,
    replyTo: DIRECT_REPLY_QUEUE,
    correlationId,
  }
);

however, I did not want to pollute the existing RequestOptions interface with the relatively large number of additional options on the amqplib's Options.Publish interface.

I'm will to adjust to this style if it's preferred over the current change.

[underfisk]

Thank you for this change. It does feel better to me as we don't need to keep mapping 1:1 each time a user needs to override something

[WonderPanda]

Published as @golevelup/nestjs-rabbitmq@5.3.0