ENH: add RangeConditionItem from #54

[ZLLentz]

Description

This adds the RangeConditionItem from #54 as-is

It doesn't work without the adjustments from #59
It needs to be revised in general because we weren't happy with it

We should do one of the following:

• Expand the operator-based checks in place
• Refactor the operator-based checks to use explicit function references

Motivation and Context

It's annoying to add three nodes for such a simple check, so this idiom generates the three nodes for me.

How Has This Been Tested?

Needs unit tests following rework

Where Has This Been Documented?

Later in pre-release notes

Pre-merge checklist

• Code works interactively
• Code follows the style guide
• Code contains descriptive docstrings, including context and API
• New/changed functions and methods are covered in the test suite where possible
• Test suite passes locally
• Test suite passes on GitHub Actions
• Ran docs/pre-release-notes.sh and created a pre-release documentation page
• Pre-release docs include context, functional descriptions, and contributors as appropriate

[ZLLentz]

Closing in favor of expanding the basic check nodes