fix(value-extractor-trait): Fix #122

[fvdb]

This will allow elements to have values extracted from them if they have a private property and public method with teh same name. See #122

Right now the value extractor fails as soon as it tries to access the private property, and does not extract the value from the public method.

Description

This adds some reflection to first check if the property is public, and if not tries the method. To minimize performance impact it only does this if both a property and method of the same name exist.

How has this been tested?

Added the test cases exposing the bug, then implemented the fix.

Types of changes

• 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 change)

PR checklist

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING.md document.
• I have added tests to cover my changes.