feat(terraform): add fix for when tf_def is a string

[maxamel]

This PR adds a fix for the _connect_module_provider method, for when tf_def item is a string and we first need to convert it to TFModule and then the flow shall continue as usual.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my feature, policy, or fix is effective and works
• New and existing tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[SteveVaknin]

💯