Upgrade to .NET 8 (weichch#43)

* Upgraded to .NET 8

Co-authored-by: Martin Tracey <1207505+matracey@users.noreply.github.com>

Add property filter and fix null property diff bug (weichch#30)

* Add property filter
* Force diff in array diff when property filter set
* Fix diff for nulls
* Fix diff context and add test
* Add release notes for 1.3.1

Update package description for 1.3.0 (weichch#26)

Fix benchmark for Linux (weichch#18)

Add semantic comparison to DeepEquals and Diff methods (weichch#8)

* Add equality comparer parameter to DeepEquals
* Add semantic comparer
* Add default diff options
* Adding tests for `DeepEquals`
* Add docs for release

Add test assertion libraries (weichch#6)

* Add JsonAssert for Xunit
* Add JsonAssert for MSTest
* Add NUnit asserts
* Add assert docs
* Tidy up benchmark result

Add jsonpatch formatter (weichch#3)

* Add formatter interface
* Refactor formatter
* Add JsonPatch formatter
* Complete JsonPatchDeltaFormatter
* Fix JsonPatch ordering
* Add more benchmarks and more target frameworks