[C#] Implement Flight SQL Client

[HackPoint]

Describe the enhancement requested

This pull request introduces a new implementation of FlightSqlClient and PreparedStatement in C#. Previously, there was no C# client for Flight SQL, leaving a significant gap for .NET developers who wished to interact with Flight SQL servers.

The implementation aligns with the existing C++ Flight SQL client API, ensuring consistent and familiar behavior across languages and providing a robust client for the Apache Arrow ecosystem in .NET.

Component(s)

C#