Container's volumes not deleted with the containers itself

[dortibi]

I used Postgres container and I also created a new type (Vault container).
each of the containers mounted a volume to the disk, after the tested finished and the container deleted, the volume was still in the disk and I needed to use docker system prune for deleted them.

To Reproduce
Steps to reproduce the behavior:

1. Run Postgres test container
2. Finish the UT gracefully saw the dispose will call
3. go to the terminal and run docker volume ls -f dangling=true
   and see the unused volumes

I tried to override the dispose method in the container class I created but the details of the containers and the used volumes are private and I couldn't access it for calling the remove after the docker removed.
also I could use your docker api client since its internal so anyway I need to do the system call separately.

there is other way to do it, by calling the container remove with the flag -v that delete the unnamed volumes with it (only unnamed volumes, I'm not sure what kind of volumes you using)

Desktop (please complete the following information):

• Server: Docker Engine - Community
  Engine:
  Version: 19.03.5
• Nuget version - 0.0.9

[HofmeisterAn]

I guess we need to set the ContainerRemoveParameters property RemoveVolumes in:

https://github.com/HofmeisterAn/dotnet-testcontainers/blob/fc9e6566acbef849ce215b801406852f3395d811/src/DotNet.Testcontainers/Client/TestcontainersClient.cs#L64

Would you like to create a pull request?