Add support for c++20

[rgsl888prabhu]

Description

This PR switches from C++17 support to C++20

Checklist

• I am familiar with the Contributing Guidelines.
• Testing
  • New or existing tests cover these changes
  • Added tests
  • Created an issue to follow-up
  • NA
• Documentation
  • The documentation is up to date with these changes
  • Added new documentation
  • NA

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[rgsl888prabhu]

/ok to test 4a4a2d4

[rgsl888prabhu]

/ok to test 5f8449b

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
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[rgsl888prabhu]

/ok to test 864fd2c

[aliceb-nv]

/ok to test 526aed5