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feat(core): add support for migrations via umzug (#209)

Basic support for migrations is now provided via umzug. `Migrator` class is available that can be used to generate new migration file with current schema diff from `SchemaGenerator`.

```typescript
const migrator = orm.getMigrator();
await migrator.createMigration(); // creates file Migration20191019195930.ts
await migrator.up(); // runs migrations up to the latest
await migrator.up('up-to-name'); // runs migrations up to given version
await migrator.down('down-to-name'); // runs migrations down to given version
```

CLI commands are also provided:

```sh
npx mikro-orm migration:create   # Create new migration with current schema diff
npx mikro-orm migration:up       # Migrate up to the latest version
npx mikro-orm migration:down     # Migrate one step down
npx mikro-orm migration:list     # List all executed migrations
npx mikro-orm migration:pending  # List all pending migrations
```

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