feat(microservices): add specific transport id to microservices

[maxbronnikov10]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/nestjs/nest/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe:

What is the current behavior?

transportId field is hardcoded in specific server classes.
If users need more concurrency on same server or many servers need to extends from base server classes and override server id
Sample:

import { CustomTransportStrategy, KafkaOptions, ServerKafka } from '@nestjs/microservices';

export const NEW_KAFKA_TRANSPORT = Symbol('NEW_KAFKA_TRANSPORT');

export class NewKafkaServer extends ServerKafka implements CustomTransportStrategy {
  //@ts-expect-error In Nest.js ServerKafka can not override transportId
  transportId = NEW_KAFKA_TRANSPORT;

  constructor(config: KafkaOptions['options']) {
    super(config);
  }
}

Issue Number:
#14590
#11298

What is the new behavior?

Add new property to microservice options interface that overrides default transportId field in specific server classes

Does this PR introduce a breaking change?

• Yes
• No

Other information

[coveralls]

Pull Request Test Coverage Report for Build bbe08a95-cdcd-4217-a5fc-b8d7fa9a8356

Details

• 30 of 30 (100.0%) changed or added relevant lines in 8 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.01%) to 89.305%

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Totals
Change from base Build 13cb620b-7c16-4b2b-9f8a-bf481bbda76e:	0.01%
Covered Lines:	7131
Relevant Lines:	7985

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💛 - Coveralls