chore: update and refactor pipeline expressions

[daniel-sanche]

This PR renames pipeline expressions to match new naming spec:

• FilterCondition->BooleanExpr
• ExprWithAlias->AliasedExpr
• eq, neq, gt, lt, gte, lte -> equal, not_equal, greater_than, less_than, greater_than_or_equal, less_than_or_equal
• if->conditional
• min, max -> minimum, maximum
• logical_min, logical_max-> logical_minimum, logical_maximum

Also used this as a chance to do some refactoring, removing unnecessary code duplication for easier scaling in the future