#268 Gridify should allow intermediate null vallues

[glacorSoul]

Description

Gridify should allow intermediate null values as per #268

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• I have performed a self-review of my code
• I have added tests that prove my fix is effective or that my feature works
• I have made corresponding changes to the documentation
• I have commented my code, particularly in hard-to-understand areas
• New and existing unit tests pass locally with my changes

[what-the-diff]

PR Summary

• Introduced BaseQueryBuilder for improved null propagation handling
  A new static class, BaseQueryBuilder, has been added which improves how the system deals with null properties. It's a significant improvement in managing data that may not always have a value.

• Refactored methods for better management of binary expressions
  The BuildQuery method has been divided to include a new method, BuildQueryFromBinaryExpression. This new method specifically manages binary expressions, making the system more efficient in processing these kinds of data structures.

• Added functionality to handle null object references in expressions
  A newly introduced function, AddNullPropagator, enhances the query building process by effectively handling situations where a reference in an expression does not have a value.

• Enhanced configurations to control handling of null references
  Changes have been made to GridifyGlobalConfiguration and GridifyMapperConfiguration classes. A new feature AvoidNullReference has been added. This allows us to customize how the system should react when it encounters data references that don't have a value.

• Introduced MemberNullPropagatorVisitor class for better null propagation management
  A new class MemberNullPropagatorVisitor has been created. It extends the ExpressionVisitor and handles null propagation in member accesses and method calls. It's designed to effectively manage certain data interactions particularly when null properties are involved.

• Added unit tests to ensure enhancements work as expected
  To validate the improvements, new unit tests have been added under Issue286Tests. Through these, we ensure that the system can accommodate null properties during the query filtering process.

[alirezanet]

Overall great improvements 💐👌,
There are some discussion points about the configuration settings and a few minor changes required.

also please don't forget documentation if you add a new feature.

[alirezanet]

Awesome job, we're almost there.

I think two more changes is needed:

• One mistake in the default value (it should be false)
• Just to make sure it doesn't break the Gridify.EntityFramework integration, it would be nice if you could add two more test cases with database integration: one with AvoidNullReference = false and one with AvoidNullReference = true. Both tests should behave as expected.
  (I suggest to add it to the EntityFrameworkPostgreSqlIntegrationTests project)

[alirezanet]

Awesome thanks 💐