feat(microservices): support nats queue per handler

[kamilmysliwiec]

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?

Issue Number: #14083

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

[coveralls]

Pull Request Test Coverage Report for Build b465639a-d132-491d-845c-e1d3bd8e4c34

Details

• 5 of 5 (100.0%) changed or added relevant lines in 1 file are covered.
• 5 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.03%) to 90.107%

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Files with Coverage Reduction	New Missed Lines	%
packages/core/helpers/execution-context-host.ts	1	90.91%
packages/websockets/exceptions/base-ws-exception-filter.ts	1	94.44%
packages/core/exceptions/base-exception-filter.ts	3	88.0%

Totals
Change from base Build 07e6b1a8-f01e-405c-8291-500903927337:	-0.03%
Covered Lines:	6968
Relevant Lines:	7733

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💛 - Coveralls