Add setting to ignore default value checker

[dylan-smith]

Fixes #121

Add a setting to ignore the default value checker

• Add a new boolean property IgnoreDefaultValueChecker to the GenFu class in src/GenFu/GenFu.cs.
• Modify the New method in the GenFu class to check the IgnoreDefaultValueChecker property before using the DefaultValueChecker.
• Add a method to set the IgnoreDefaultValueChecker property in the GenFuConfigurator class in src/GenFu/GenFuConfigurator.cs.
• Add tests in tests/GenFu.Tests/GenFuTests.cs to verify the new behavior of ignoring the default value checker.

---

For more details, open the Copilot Workspace session.