Support of pymssql officially stopped in November 2019 in favor of pyODBC. This change updates sqlmlutils to use pyODBC instead, and changes the version from 0.7.2 -> 0.8.0.

This change brings a few other changes as well:

1. pymssql allows us to capture the informational messages that come from SQL Server, but pyODBC does not (see here). This means that any output from sp_execute_external_script cannot be captured in a convenient way when using pyODBC. Instead, we capture the output inside python and send it to the caller using output parameters.

2. pyODBC allows us to easily implement output parameters, and since we need them for the above stdout problem, we have added them here. As part of this change, stored procedure execution now return a tuple of type (DataFrame, dictionary) where the first element is the OutputDataSet and the second is a dictionary of output parameters.

3. pyODBC allows us to parameterize the sql queries instead of using concatenated strings. This also allows us to transfer larger binaries, which is useful for package management.

4. Some code refactoring, including using f-strings for code reading ease instead of .format in a number of places.

5. Export Scope as well so the user doesn't have to dig for the correct module to find Scope for package management.

6. Changed a number of tests that were using old package versions so that they are up to date, and to speed up testing.