Feature PR: Add request cancellation to http service

[Boshen]

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?

[*] Feature

Does this PR introduce a breaking change?

[ ] Yes
[*] No

Other information

use case:

this.httpService.request(...).pipe(timeout(1000))

we can then cancel this request upon timeout, saving a little bit of resource, and stop axios interceptors processing the timed-out response.

[coveralls]

Pull Request Test Coverage Report for Build 11623

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 95.436%

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Totals
Change from base Build 11601:	0.0%
Covered Lines:	4475
Relevant Lines:	4689

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💛 - Coveralls

[kamilmysliwiec]

Very interesting improvement. Thank you!

[lock]

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