Changed to allow overlapping use when using @AsyncApiSub / @AsyncApiPub

[ChoSeoHwan]

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• 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
[x] 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?

When using multiple @AsyncApiPub or @AsyncApiSub in one method, only the last document data is applied.

gateway

docs

What is the new behavior?

If multiple @AsyncApiPub or @AsyncApiSub are used in one method, all applied document data is applied.

docs

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[ChoSeoHwan]

I know how to use it like below,

  @AsyncApiSub(
    {
      channel: EventPatternsWS.createFeline,
      message: [
        {
          name: 'oneOf demo #1',
          payload: FelineRto,
        },
        {
          name: 'oneOf demo #2',
          payload: FelineExtendedRto,
        }
      ]
    },
    {
      channel: EventPatternsWS.wantFeline,
      message: {
        payload: FelineRto,
      }
    }
  )
  async emitCreatedFeline(felineRto: FelineRto) {
    this.server.emit(EventPatternsWS.createFeline, felineRto);
  }

Duplicated use of @AsyncApiSub/@AsyncApiPub will give users more options.

For example, if there is an event commonly used in multiple projects,
You can declare Decorator in advance in a common file and redundantly declare it in addition to existing events if necessary.

common

export const AsyncApiRefreshToken = () => AsyncApiSub({
  channel: 'common/refresh_token',
  message: {
    payload: TokenDto
  }
});

gateway

  @AsyncApiSub(
    {
      channel: EventPatternsWS.createFeline,
      message: [
        {
          name: 'oneOf demo #1',
          payload: FelineRto,
        },
        {
          name: 'oneOf demo #2',
          payload: FelineExtendedRto,
        }
      ]
    }
  )
  @AsyncApiRefreshToken()
  async emitCreatedFeline(felineRto: FelineRto) {
    this.server.emit(EventPatternsWS.createFeline, felineRto);
  }