[Oauth2 Server] Embedded SQL scripts directly in the installation

[mnocon]

Target: 4.6, 5.0

Avoiding piping the output of the command directly, as described in ibexa/doctrine-schema#21 (comment) - this is not the a good practice.

The command itself is also saying:

 !
 ! [CAUTION] This operation should not be executed in a production environment!
 !
 !
 !
 !           Use the incremental update to detect changes during development and use
 !
 !           the SQL DDL provided to manually update your database in production.
 !
 !
 !

When merging to 5.0, the following change needs to be made: https://github.com/ibexa/oauth2-server/pull/40/files

[github-actions]

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• docs/users/oauth_server.md