Make azure-json transitive in azure-core module-info

[alzimmermsft]

Description

Make the azure-json requires in the module-info for azure-core transitive so downstream libraries don't need to add it as required in their module-info as well.

Libraries already requiring azure-json in their module-info will need to be updated after azure-core releases as removing it now may break their build as they depend on released versions of azure-core which don't perform transitive requires.

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• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.

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• Title of the pull request is clear and informative.
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Testing Guidelines

• Pull request includes test coverage for the included changes.

[srnagar]

@billwert Identity should now be able to use azure-json without changing module-info.java

[billwert]

Yup. I'll pull it in before we release next week.