refactor: remove @loopback/openapi-v3 from dependencies

[bajtos]

Import OpenAPI-related helpers from @loopback/rest instead.

See #5692

Checklist

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• 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

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[raymondfeng]

Please fix build errors:

extensions/typeorm/src/typeorm.utils.ts:10:8 - error TS2307: Cannot find module '@loopback/openapi-v3' or its corresponding type declarations.
10 } from '@loopback/openapi-v3';
          ~~~~~~~~~~~~~~~~~~~~~~

[raymondfeng]

Please address #5932 (comment)

[bajtos]

Please fix build errors:

extensions/typeorm/src/typeorm.utils.ts:10:8 - error TS2307: Cannot find module '@loopback/openapi-v3' or its corresponding type declarations.
10 } from '@loopback/openapi-v3';
          ~~~~~~~~~~~~~~~~~~~~~~

Weird. npm it is passing on my machine 🤔 I'll investigate.

[bajtos]

Managed to reproduce the problem after running npm run clean:lerna. The commit 25bd30b is fixing the issue by moving @loopback/rest from dev-dependencies to regular dependencies, using the same approach as in #5927. Once these two PRs are landed, I can open a follow-up PR to move @loopback/rest to peer-dependencies.

@raymondfeng LGTY now?