Feat: Cloud connection arguments

[quinchs]

Summary

This PR adds support for connecting to cloud instances, in short:

• EdgeDBConnection.Parse resolves cloud instance names from both instance and dsn parameters.
• EdgeDBBinaryClient will send secret_key parameter in the ClientHandshake message if its present in the EdgeDBConnection.
• Cloud instance name parsing is handled by this method: https://github.com/edgedb/edgedb-net/blob/b3f56e6285b933984b89fca025864e212f0f2f6f/src/EdgeDB.Net.Driver/EdgeDBConnection.cs#L470-L520