ENG-868-Add describe() method to each of the relational integrations.

[Fanjia-Yan]

Describe your changes and why you are making these changes

This PR seeks to add a describe() functionality for relational integrations. The existing relational integration has a describe() method that prints out the integration information. Thereafter, I add a display of list of table inside the integration. The table name displayed is limited to the number of display from df.head() because if there are large number of tables, this method is not user friendly.

Update

Related issue number (if any)

https://linear.app/aqueducthq/issue/ENG-868/add-describe-method-to-each-of-the-relational-integrations

Checklist before requesting a review

• I have created a descriptive PR title. The PR title should complete the sentence "This PR...".
• I have performed a self-review of my code.
• I have included a small demo of the changes. For the UI, this would be a screenshot or a Loom video.
• If this is a new feature, I have added unit tests and integration tests.
• I have run the integration tests locally and they are passing.
• All features on the UI continue to work correctly.
• Added one of the following CI labels:
  • run_integration_test: Runs integration tests
  • skip_integration_test: Skips integration tests (Should be used when changes are ONLY documentation/UI)

[cw75]

@Fanjia-Yan Could you make it clear in the print statement that we are only listing the first 5 table names?