Add using type declaration

[rafaelrojasmiliani]

Add feature to write using keyword to define types as

using FooType = double;

[yuchdev]

Thank you for your contribution!
Did you check unit tests passed?
because, if you change the test logic, usually you should change test assets as well

[rafaelrojasmiliani]

Good question. I will check it soon.

[rafaelrojasmiliani]

I fixed the file create_assets.py. All the tests passed. I hope this is ok for your project. Thanks!