Add support for open generic type bindings in FilterConvention

[PHILLIPS71]

Description

This PR adds support for binding open generic types to filter types in FilterConvention, addressing a limitation where you had to manually register every concrete generic type instance.

Problem

Previously, the BindRuntimeType method only supported exact type matches. For generic types like Id<T>, you were forced to bind each concrete implementation individually:

// before: required for every generic type instance
descriptor.BindRuntimeType<Id<User>, IdOperationFilterInput>();
descriptor.BindRuntimeType<Id<Product>, IdOperationFilterInput>();
descriptor.BindRuntimeType<Id<Order>, IdOperationFilterInput>();
// ... dozens more bindings

This was non-ergonomic and defeated the purpose of generic types in C#.

Solution

Enhanced the TryCreateFilterType method in FilterConvention to support open generic type bindings:

// after: single binding for all generic type instances
descriptor.BindRuntimeType(typeof(Id<>), typeof(IdOperationFilterInput));

The implementation directly addresses the core issue raised in #7082 - the inability to bind open generic types and the resulting need to manually register each concrete generic type instance.

[michaelstaib]

We will look at this for version 16 as we are doing more work in the HotChocolate.Data area.