Fix/add ability to set pub sub decorators together

[MaksimKiselev]

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?

This PR address this issue, that was initially evaluated as feature. #465

[x] 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?

Issue Number: 465

What is the new behavior?

AsyncApiPub and AsyncApiSub decorators now creates method decorator with different meta keys

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[flamewow]

@MaksimKiselev thanks for handling that thing
https://www.npmjs.com/package/nestjs-asyncapi/v/1.1.1

[Pedr0Rocha]

Any idea why my subs are returning an object instead of an array here after this change?
https://github.com/flamewow/nestjs-asyncapi/pull/473/files#diff-bc32787f3b434f34f1cf6480e670abbcd25092915b971c0f234579c24c8379b6R16

{
  '0': {
    channel: 'test',
    message: {
      payload: [Object],
      name: 'HealthController#getHealth',
      headers: undefined
    },
    type: 'sub'
  }
}

as a result I get this error:

const metadataCombined = [...metadataOperations || [], ...metadataSubs || [], ...metadataPubs || []];
                                                                           ^
TypeError: (metadataSubs || []) is not iterable
    at exploreAsyncApiOperationMetadata (/nestjs-asyncapi/dist/lib/explorers/asyncapi-operation.explorer.js:23:76)

I tried reproducing the same behaviour in the sample app but I couldn't, it returns an array as it should.

[MaksimKiselev]

@Pedr0Rocha are you build your nest app with tsc compiler?

Can you please provide your tsconfig* files, package.json (deps, devDeps)?

[Pedr0Rocha]

It was fixed here: 5069e22

Thanks