feat(microservices): add return buffers option for binary data

[Forceres]

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?

Now we can't directly get buffers from redis, so any custom binary formats are broken. Moreover, our redis output has to be json that contradicts to custom binary formats.

What is the new behavior?

We can pass returnBuffers to client options for listening on "messageBuffer" instead of "message" to get directly buffers from redis. createResponseCallback handles jsons as well as binary (but we have to pass custom deserializer to decode id from it)

Does this PR introduce a breaking change?

• Yes
• No

[coveralls]

Pull Request Test Coverage Report for Build 472dd428-2ae6-4d12-bfd5-a48cbbd1c630

Details

• 6 of 9 (66.67%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.03%) to 89.828%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
packages/microservices/client/client-redis.ts	6	9	66.67%

Files with Coverage Reduction	New Missed Lines	%
packages/microservices/client/client-redis.ts	1	79.39%

Totals
Change from base Build bcb7b573-9798-42cb-a347-1d1f9e70592c:	-0.03%
Covered Lines:	7603
Relevant Lines:	8464

---

💛 - Coveralls

[kamilmysliwiec]

Could you please add an integration test for this as well?

[Forceres]

Could you please add an integration test for this as well?

Yeah, give me some time.