feat(cli): add prefix to openapi generator

[aaqilniz]

The lb4 openapi generator can accept a prefix to add to the resources generated based on the provided specs.

Initially, I added this to fix this issue. But I thought of this as a feature for users to generate APIs for more than one openapi specs by adding a prefix to them.

Checklist

• DCO (Developer Certificate of Origin) signed in all commits
• npm test passes on your machine
• New tests added or existing tests modified to cover all changes
• Code conforms with the style guide
• API Documentation in code was updated
• Documentation in /docs/site was updated
• Affected artifact templates in packages/cli were updated
• Affected example projects in examples/* were updated

👉 Check out how to submit a PR 👈

[coveralls]

Pull Request Test Coverage Report for Build 8877428755

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall first build on feat/openapi-prefix at 55.332%

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Totals
Change from base Build 8861530642:	55.3%
Covered Lines:	9563
Relevant Lines:	12458

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💛 - Coveralls

[aaqilniz]

Hi, @samarpanB. Can you please have a look at this PR?