Add portable column-plus-primary-key and unique-constraint removal APIs - #197

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'GetColumns' has a cyclomatic complexity of '52'. Rewrite or refactor the code to decrease its complexity below '26'. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1502)

'ConfigureParameterWithValue' has a cyclomatic complexity of '28'. Rewrite or refactor the code to decrease its complexity below '26'. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1502)

'Parse' has a cyclomatic complexity of '36'. Rewrite or refactor the code to decrease its complexity below '26'. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1502)

'SplitSqlServer' has a cyclomatic complexity of '29'. Rewrite or refactor the code to decrease its complexity below '26'. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1502)

'MigrateTo' has a cyclomatic complexity of '35'. Rewrite or refactor the code to decrease its complexity below '26'. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1502)

'ITransformationProvider.GetColumns(string)' is obsolete: 'We cannot resolve the DbType or MigratorDbType exactly so the result is just a guess. Also the default value in the result is depending on DbType and therefore also a guess. Do not use this method any more. Look up the type in your migration history.'

'ITransformationProvider.GetColumnByName(string, string)' is obsolete: 'We cannot resolve the DbType or MigratorDbType exactly so the result is just a guess. Also the default value in the result is depending on DbType and therefore also a guess. Do not use this method any more. Look up the type in your migration history.'

'ITransformationProvider.GetColumns(string)' is obsolete: 'We cannot resolve the DbType or MigratorDbType exactly so the result is just a guess. Also the default value in the result is depending on DbType and therefore also a guess. Do not use this method any more. Look up the type in your migration history.'

'ITransformationProvider.RemoveAllConstraints(string)' is obsolete: 'Drop all constraints separately.'