Refactor namespaces and enhance code structure

Key changes include:
- Enhanced organization of the `RqlExpression` class with method regions for better readability.
- Updated `RqlOperators` and `RqlSelectModes` enums to include the `[Flags]` attribute for improved usability.
- Refactored `RqlPropertyAttribute` for streamlined handling of actions, operators, and selection modes.
- Introduced interfaces like `IRqlNode` and `IRqlQueryable` to promote better object-oriented design.
- Restructured `RqlSettings` and related classes for cohesive configuration management.
- Updated test files to ensure relevance and functionality with the new structure.

These changes aim to improve modularity, readability, and maintainability while adhering to modern C# practices.

Author: damir-usmanov

samples/Rql.Sample.Api/Extensions/Core/ErrorResultProvider.cs

@@ -1,7 +1,7 @@
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Mvc.Infrastructure;
 using Microsoft.AspNetCore.Mvc.ModelBinding;
-using SoftwareOne.Rql.Linq.Core.Result;
+using SoftwareOne.Rql.Abstractions.Result;
 
 namespace Rql.Sample.Api.Extensions.Core;
 

samples/Rql.Sample.Api/Extensions/Core/IErrorResultProvider.cs

@@ -1,5 +1,5 @@
 using Microsoft.AspNetCore.Mvc;
-using SoftwareOne.Rql.Linq.Core.Result;
+using SoftwareOne.Rql.Abstractions.Result;
 
 namespace Rql.Sample.Api.Extensions.Core;
 

samples/Rql.Sample.Api/Extensions/Core/RqlRequest.cs

@@ -1,6 +1,7 @@
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
 using SoftwareOne.Rql;
+using SoftwareOne.Rql.Abstractions;
 using System.Globalization;
 using System.Linq.Expressions;
 

src/SoftwareOne.Rql.Linq/Configuration/Filter/RqlFilterSettings.cs renamed to src/SoftwareOne.Rql.Abstractions/Configuration/Filter/RqlFilterSettings.cs

@@ -1,4 +1,4 @@
-namespace SoftwareOne.Rql.Linq.Configuration.Filter
+namespace SoftwareOne.Rql.Abstractions.Configuration.Filter
 {
     public class RqlFilterSettings
     {

src/SoftwareOne.Rql.Linq/Configuration/Filter/RqlStringFilterSettings.cs renamed to src/SoftwareOne.Rql.Abstractions/Configuration/Filter/RqlStringFilterSettings.cs

@@ -1,4 +1,4 @@
-namespace SoftwareOne.Rql.Linq.Configuration
+namespace SoftwareOne.Rql.Abstractions.Configuration.Filter
 {
     public class RqlStringFilterSettings
     {

src/SoftwareOne.Rql.Abstractions/Configuration/IRqlGlobalSettings.cs

@@ -0,0 +1,6 @@
+namespace SoftwareOne.Rql.Abstractions.Configuration;
+
+public interface IRqlGlobalSettings
+{
+    RqlGeneralSettings General { get; }
+}

src/SoftwareOne.Rql.Abstractions/Configuration/IRqlSettings.cs

@@ -0,0 +1,12 @@
+using SoftwareOne.Rql.Abstractions.Configuration.Filter;
+
+namespace SoftwareOne.Rql.Abstractions.Configuration;
+
+public interface IRqlSettings
+{
+    RqlMappingSettings Mapping { get; init; }
+
+    RqlSelectSettings Select { get; init; }
+
+    RqlFilterSettings Filter { get; init; }
+}

src/SoftwareOne.Rql.Linq/Configuration/RqlGeneralSettings.cs renamed to src/SoftwareOne.Rql.Abstractions/Configuration/RqlGeneralSettings.cs

@@ -1,4 +1,4 @@
-namespace SoftwareOne.Rql.Linq.Configuration;
+namespace SoftwareOne.Rql.Abstractions.Configuration;
 
 public class RqlGeneralSettings
 {

src/SoftwareOne.Rql.Linq/Configuration/RqlMappingSettings.cs renamed to src/SoftwareOne.Rql.Abstractions/Configuration/RqlMappingSettings.cs

@@ -1,4 +1,4 @@
-namespace SoftwareOne.Rql.Linq.Configuration;
+namespace SoftwareOne.Rql.Abstractions.Configuration;
 
 public class RqlMappingSettings
 {

src/SoftwareOne.Rql.Abstractions/Configuration/RqlSelectSettings.cs

@@ -0,0 +1,10 @@
+namespace SoftwareOne.Rql.Abstractions.Configuration;
+
+public class RqlSelectSettings
+{
+    public RqlSelectModes Implicit { get; set; }
+
+    public RqlSelectModes Explicit { get; set; }
+
+    public int? MaxDepth { get; set; }
+}