Export names of default constraints.

[lmeyer1]

Description

Adds the names of the default constraints in the create table scripts

Checklist

Please ensure your pull request fulfills the following requirements:

• [ x ] The commit messages follow our guidelines (CONTRIBUTING.md).
• Tests for any changes have been added (for bug fixes / features).
• Docs have been added / updated (for bug fixes / features).

Type

What kind of change does this pull request introduce?

[ x ] Bug.
[ x ] Feature.
[ ] Code style update (formatting, local variables).
[ ] Refactoring (no functional changes, no api changes).
[ ] Build related changes.
[ ] CI related changes.
[ ] Documentation content changes.
[ ] Other (please describe below).

Breaking Changes

Does this pull request introduce any breaking changes?

[ x ] Yes
[ ] No

The text of the script generated before and after will be different for the same table.

Other Information

This pull request is related to the issue #80