feature: move migrations commands to the new db namespace

[thetutlage]

Fixes: FRMW-2675, FRMW-2665

This PR adds the following new commands to the db namespace.

• db:migrate: This command will run the migrations and the also sync the links, unless --skip-links flag is specified.
• db:rollback: Rolls-back last batch of migrations for one or more selected modules.
• db:generate: Generates migrations for one or more selected modules.

The db:migrate command accepts and forwards the --execute-all-links and --execute-safe-links to the sync-links command.

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Latest commit: 89861d8

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[olivermrbl]

LGTM