Add OAuthBearer authentication support for rdkafka

[andrewstanovsky]

Description

Adds support for OAuthBearer authentication flow for rdkafka client when Kafka server expects/supports it. The 'tokenProvider' is supposed to be set via nconf programatically.

Breaking Changes

server/routerlicious/packages/services-ordering-rdkafka/src/rdkafkaBase.ts introduces connect() method breaking change by changing its return value from 'void' to 'Promise'. This is needed for tokenProvider's call convenience and overall maintainability/readability of the code.

Reviewer Guidance

This change has been verified with FRS and three types of Kafka server:

• HDI Kafka w/ SSL auth
• Event Hubs w/ connection string
• Event Hubs w/ managed identity

Another change that is not directly related to the main topic is fix for incorrect node-rdkafka's feature filtering

		const rdKafkaHasSSLEnabled = kafka.features.filter((feature) =>
			feature.toLowerCase().includes("ssl"),
		);

The rdKafkaHasSSLEnabled will have an empty array if ssl is not included. Which later would be checked with the following line:

		if (!rdKafkaHasSSLEnabled) {

The problem with this line is that it will always be false whether rdKafkaHasSSLEnabled contains ssl entry or it's completely empty. Empty array is still not null/undefined, so the condition will be false.

I've changed it to an array of lower case values from the original one of rdkafka (redundant step, since it always contains lower case features, but to make sure it's always lower case and it doesn't change the previous logic).

		const lcKafkaFeatures = kafka.features.map((s) => s.toLowerCase());

And new way of checking it traverses this new array and checks it with the includes() method:

		if (!lcKafkaFeatures.includes("ssl")) {