Handle different types of results in ExecuteScript

[arnonax-tr]

Fixes bug #108

Notes

1. I added 4 tests, one for primitive types and one for array - both work. And two additional tests, one for native JavaScript objects and the other for IWebElement which I couldn't make them to work, so I annotated them with [Ignore] for documentation purposes. If you have an idea how to make them work too, it would be great. But without them there's still a lot of value for me in this PR.
2. I changed the .net framework of the test project to net8.0, because it failed to build on my machine with net6.0. Feel free to revert this change if it works for you (I also failed to build the pipeline project but I just unloaded this project which doesn't affect any file in the repo).