Add DateTimeOffsetValueComparer

[cimnine]

🤔 What's changed?

Adds a DateTimeOffsetValueComparer, fixes #179.

⚡️ What's your motivation?

We mostly use DateTimeOffset instead of DateTime in our projects.

🏷️ What kind of change is this?

• 🐛 Bug fix (non-breaking change which fixes a defect)

♻️ Anything particular you want feedback on?

📋 Checklist:

• I've changed the behaviour of the code
  • I have added/updated tests to cover my changes.
• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
• Users should know about my change
  • I have added an entry to the "[vNext]" section of the CHANGELOG, linking to this pull request & included my GitHub handle to the release contributors list.

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[gasparnagy]

@cimnine This makes sense. Could you please check the runtime test failures?

In general it is also worth noting that we did have a retriever for DateTimeOffset, but not a comparer (I don't know why).

[cimnine]

Could you please check the runtime test failures?

Done.

[gasparnagy]

Thx for the fix!

[gasparnagy]

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