Add pre-configured test container for MongoDB

[RMariowski]

Is your feature request related to a problem? Please describe.
I started working on my personal project that is using multiple different databases and I'm using dotnet-testcontainers for more convenient way of testing. However as there's no pre-configured test container of MongoDB, I decided to write it for my own purposes, but as well I can also share it.

Describe the solution you'd like
I would like to see a pre-configured test container of MongoDB as is for other databases like Oracle, MySQL etc.

Additional context
Here's link to the branch from my fork as a potential PR: link

[HofmeisterAn]

👍 I'll take a look at it next week or the week after.

[HofmeisterAn]

Your changes look good, thanks. I would prefer to provide modules in separate dependencies to support more module specific functions, but we do not have the infrastructure yet.

A PR is more than welcome! Thanks, again.

[HofmeisterAn]

#400