feature(microservices) add a few options to the nats strategy + general refactor

[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
[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?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[coveralls]

Coverage decreased (-0.06%) to 93.628% when pulling 06d0f12 on feature/nats-queue into 656ecf8 on master.

[JonathanMeyer2600]

Hi Kamil,

I am really looking forward for the nats queue feature. When are you planning to release this?
Can I help somehow?
Thanks in advance!

[lock]

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