fix: add information about foreign key

[aaqilniz]

Show relationship-related details on openapi specs.

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

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[coveralls]

Pull Request Test Coverage Report for Build 8657413748

Details

• 56 of 72 (77.78%) changed or added relevant lines in 2 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.06%) to 55.432%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
packages/repository-json-schema/src/build-schema.ts	49	65	75.38%

Files with Coverage Reduction	New Missed Lines	%
packages/openapi-v3/src/json-to-schema.ts	1	79.65%

Totals
Change from base Build 8646446166:	0.06%
Covered Lines:	9616
Relevant Lines:	12527

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💛 - Coveralls