Update FbDataReader.cs

[BFuerchau]

• simplified GetFieldValue, GetFieldValueAsync, adding missing cancellationToken
• modified GetValues(object[] values)

Advantage: Instead of call for each value GetValue(i), call directly the _row[i].GetValue(). This i less number of calls and no type compares, where typeof(object) is everytime the last one.

• the same advantage for _command.ExpectedColumnTypes

The performance could increase up to 20% when loading resultsets e.g. to DataTable, like DbDataAdapter does

[BFuerchau]

Ok, i kill all request and will try with a new copy.