Import mysql connector using lerna import

[dhmlau]

Part of #890 epic

IMPORTANT
Keep the amount of changes made in the actual code as little as possible. Not allowed: changes in the way how connector works (functionality/behavior/API), how the code is structured or formatted.

If the imported code does not pass code linting and/or prettier formatting rules, then changes to make the code compliant must be done in a standalone commit.

Acceptance Criteria

Using the same monorepo created in ##1725

• import loopback-connector-mysql using lerna import
• Set up Travis for CI - how to test and build using Travis
• find a way and document how to build and test locally
  • set up db using docker

Reference

See more detailed discussion: #890

[stale]

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[stale]

This issue has been closed due to continued inactivity. Thank you for your understanding. If you believe this to be in error, please contact one of the code owners, listed in the CODEOWNERS file at the top-level of this repository.