Properly handle implicit database dependencies for CREATE/ALTER DATABASE commands

```sql
psql> set citus.enable_create_role_propagation to off;
psql> create role onur;
NOTICE: not propagating CREATE ROLE/USER commands to other nodes
HINT: Connect to other nodes directly to manually create all necessary users and roles.

psql> create database new owner onur;
ERROR: role "onur" does not exist
CONTEXT: while executing command on localhost:9701
```

We call EnsureAllObjectDependenciesExistOnAllNodes in PostprocessCreateDatabaseStmt however it cannot automatically create the "owner" role on workers because it's indeed not a dependency of the database.

In addition to calling EnsureAllObjectDependenciesExistOnAllNodes for the database, we should probably call EnsureObjectAndDependenciesExistOnAllNodes for;
1. "owner" role
2. tablespace
3. template database
4. ...

settings that are specified in CREATE DATABASE command.

(Today "2" doesn't make sense as we don't know how to propagate tablespaces)