feature(common) move createResponseBody to HttpException

[iveselin]

renamed and moved createResponseBody function to be exported as a part
of HttpException

Closes #2727

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: #2727

What is the new behavior?

Easier creation of custom http exceptions with body that is uniform with built in exceptions

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[coveralls]

Pull Request Test Coverage Report for Build 4165

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.006%) to 95.229%

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Totals
Change from base Build 4098:	-0.006%
Covered Lines:	3633
Relevant Lines:	3815

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💛 - Coveralls

[lock]

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