feat(core): Add run_containers function in utils.py to run several containers

[surister]

This utils method runs containers on the same context manager. This ensures that the passed containers are run in order and cleaned up.

The main use case is to be able to run code after all containers have started. I need this to create CrateDB clusters.

Practical example: run containers inside a network and clean up the network (network can only be cleaned up after all containers using it are stopped)

network = Network()
network.create()

with run_containers(
        PostgresContainer(network=network),
        PostgresContainer(image='postgres:16', network=network),
) as containers:
    c1, c2 = containers
    conn1 = sqlalchemy.engine.create_engine(c1.get_connection_url()).connect()
    conn2 = sqlalchemy.engine.create_engine(c2.get_connection_url()).connect()

    result1 = conn1.execute(sqlalchemy.text("select version()")).fetchone()
    result2 = conn2.execute(sqlalchemy.text("select version()")).fetchone()

    print(result1, result2, sep='\n')

# The network gets removed only when containers are stopped.
network.remove()

[alexanderankin]

if we add this can we name it consistently with any one of the other implementations, thanks

[surister]

if we add this can we name it consistently with any one of the other implementations, thanks

Hm, could you like any of the other implementations? Can't find them @alexanderankin