fix(query): modernize CalculationFilterGroup and adjust IsValid behavior

Refactors the `CalculationFilterGroup` class to utilize C# primary constructors and property initializers, improving conciseness and readability.

The `IsValid()` method's logic is updated. Previously, it returned true if *any* filter in the group was valid. Now, it returns true only if *all* filters are valid, and an empty filter group is considered valid. This adjustment clarifies the group's validity criteria, aligning with common interpretations for `All` operations and addressing related technical debt.

src/Strata.SqlTools.Query/CalculationFilterGroup.cs

@@ -2,24 +2,16 @@ using System.Text.Json.Serialization;
 
 namespace Strata.SqlTools.Query;
 
-public class CalculationFilterGroup
+[method: JsonConstructor]
+public class CalculationFilterGroup(IEnumerable<CalculationFilter> filters, LogicalOperator logicalOperator)
 {
     // Hereditary logical operation applied to all Filters
-    public LogicalOperator LogicalOperator { get; set; }
+    public LogicalOperator LogicalOperator { get; set; } = logicalOperator;
 
-    public IEnumerable<CalculationFilter> Filters { get; set; }
+    public IEnumerable<CalculationFilter> Filters { get; set; } = filters;
 
-    public CalculationFilterGroup()
+    public CalculationFilterGroup() : this([], LogicalOperator.And)
     {
-        LogicalOperator = LogicalOperator.And;
-        Filters = new List<CalculationFilter>();
-    }
-
-    [JsonConstructor]
-    public CalculationFilterGroup(IEnumerable<CalculationFilter> filters, LogicalOperator logicalOperator)
-    {
-        Filters = filters;
-        LogicalOperator = logicalOperator;
     }
 
     public IEnumerable<CalculationFilter> GetValidFilters()
@@ -29,6 +21,6 @@ public class CalculationFilterGroup
 
     public bool IsValid()
     {
-        return Filters != null && Filters.Any(x => x.IsValid());
+        return Filters.All(x => x.IsValid());
     }
 }