Incorporate Schema Migrator

[szwedm]

Description

Incorporate Schema Migrator from control-plane repository and make it an internal component to discourage external usage.

Related issue(s)

See #1185

[kyma-bot]

Skipping CI for Draft Pull Request. If you want CI signal for your change, please convert it to an actual PR. You can still manually trigger a test run with /test all

[github-actions[bot]]

Add one of following labels

- kind/feature -> Use it when you want to submit a new feature

- kind/enhancement -> Use it when you modify or improve an existing feature

- kind/bug -> Use it when you fix a bug

[szwedm]

/hold

[szwedm]

/unhold