qmk find: expand operator support

[fauxpark]

Description

Replacing the singular key = value expression with support for the following operators:

• key == value: Match targets where key is equal to value. May include wildcards such as * and ?.
• key != value: Match targets where key is not value. May include wildcards such as * and ?.
• key < value: Match targets where key is a number less than value.
• key > value: Match targets where key is a number greater than value.
• key <= value: Match targets where key is a number less than or equal to value.
• key >= value: Match targets where key is a number greater than or equal to value.

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Keyboard (addition or update)
• Keymap/layout (addition or update)
• Documentation

Issues Fixed or Closed by This PR

Checklist

• My code follows the code style of this project: C, Python
• I have read the PR Checklist document and have made the appropriate changes.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).