feat(core): add options to the legacy route converter

[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
• 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
• No

Other information

[coveralls]

Pull Request Test Coverage Report for Build f299d3d7-13c9-459a-b181-c45dcabd9b5b

Details

• 3 of 6 (50.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.002%) to 89.294%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
packages/core/router/legacy-route-converter.ts	3	6	50.0%

Totals
Change from base Build 85a739d2-3518-46d4-be1b-5c7d3550fc77:	0.002%
Covered Lines:	7148
Relevant Lines:	8005

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💛 - Coveralls