feat(common) add log levels (error, info, etc union)

[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: #1838

What is the new behavior?

Example:

NestFactory.create(AppModule, {
   logger: ['info', 'warning'],
});

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[coveralls]

Pull Request Test Coverage Report for Build 4306

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 10 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.02%) to 95.248%

---

Files with Coverage Reduction	New Missed Lines	%
packages/microservices/client/client-proxy.ts	1	98.11%
packages/core/injector/module.ts	9	86.87%

Totals
Change from base Build 4296:	-0.02%
Covered Lines:	3648
Relevant Lines:	3830

---

💛 - Coveralls

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.