136 mysql query execution

[eastandwestwind]

Purpose

Adds query execution support for MySQL Connector.

Changes

• Adds integration access and erasure tests for MySQL, and 1 missing one for MsSQL
• Overrides SQLConnector where appropriate to handle LegacyCursorResult return type from SQLAlchemy.
• Updates Postman Collection and Postman Docs to reflect MySQL-specific config

Checklist

• Applicable documentation updated (guides, quickstart, postman collections, tutorial, fidesdemo, database diagram
• Good unit test/integration test coverage

Ticket

Fixes #136

[pattisdr]

thank you @eastandwestwind, well-organized, easy to follow, just a few changes requested ⭐

[eastandwestwind]

Thanks for the comments @pattisdr ! Ready for review again

[pattisdr]

Wonderful @eastandwestwind!

More of a general comment, related to Sean's testing work, it will be good when we are testing each datastore against every data type; we may be missing datastore-specific handling in places. But this PR definitely demonstrates basic MySQL access/erasures in line with how we introduced the other datastores and we can continue to improve our test matrix. Thanks again for adding MySQL to the postman collection!