Allow load run doctrine::migrations::migrate on a single namespace

[VincentLanglet]

Feature Request

Q	A
New Feature	yes
RFC	yes
BC Break	no

Summary

I didn't found out the feature so far, maybe I missed it.
In the same way, it's possible to run

bin/console do:mi:diff --namespace=before
bin/console do:mi:diff --namespace=after

I'd like to be able to run

bin/console do:mi:mi --namespace=before
bin/console do:mi:mi --namespace=after

so only running migrations from a specific namespace.

The option existe on execute and on diff, but not on migrate.

For the context I'd like to run specific migrations Before the production and some migrations After the deployement.

I found some issues related to namespace like #1074 and the @goetas article (https://www.goetas.com/blog/multi-namespace-migrations-with-doctrinemigrations-30/) but it doesn't seems to answer to this issue.

[soorajlv]

I did come across the necessity of the same feature to implement a multi-tenant system where main migrations go to master tables and tenant migrations go to tenant tables. For the time being, I am using a forked version of "mapeveri/multi-tenancy-bundle" to achieve the functionality, but it would be great if the migration bundle supports the functionality out of the box