Element condition refactoring

[brandonkelly]

Laying the groundwork for nested condition groups, which could be combined with OR operators.

• Move element query param application logic into static methods, so it’s accessible for arbitrary Builders.
• Split modifyQuery() out of ElementConditionRuleInterface, into ElementQueryConditionRuleInterface(), and modify signature to accept a Builder arg instead of the main element query, which it should modify directly (e.g. via new query param static methods).
• Update ElementCondition to call condition rules’ modifyQuery() methods from within $query->beforeQuery(), passing the Builder object to them.

[github-actions]

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