feat: add support for system.text.json

[mozts2005]

Description

update to .NET 6.0 and add System.Text.Json

Checklist

• I have read the CONTRIBUTING.md
• I have signed the CLA
• The title of the PR is clear and informative
• The ChangeLog.md has been updated.
• If applicable, the changes made in the PR have proper test coverage

[commit-lint]

Features

• add support for system.text.json (47c2fbb)

Contributors

mozts2005

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