Updated to dotnet 10 - some data connectors updated too

[David-Mawer]

Well - i downloaded the code to see how it works, and to try it out on my shiny new .net 10 project.

I hit the following issues: -

• The MVC and Angular demo projects didn't work.
• The project doesn't support .net 10
• The Microsoft data connector uses System.Data.SQLClient (which is getting deprecated).

So - I fixed all of those (hopefully obeying the code standards).

This branch is different to master in the following ways: -

• Nu-get packages are the latest available (except for data connectors that I don't know how to test)
• library supports .net 10 (not .net 8)
• MsSQL data connector changed from System.Data.SQLClient to Microsoft.Data.SQLClient (the two libraries have exactly the same interface - just a different "using" statement).
• Also Updated the dependencies for the following data connectors: ODBC, MySQL, Firebird, Excel, Cassandra