added skip relation search option

[crimsonskyrem]

Hello!

• Type: new feature
• Link to issue: https://github.com/phalcon/phalcon-devtools/issues/1524

In raising this pull request, I confirm the following (please check boxes):

• [x] I have read and understood the Contributing Guidelines
• [x] I have checked that another pull request for this purpose does not exist
• [x] I wrote some tests for this PR

Small description of change:

Add '--no-relation' option to skip table relation search

Thanks