Add cosmos db emulator module

[mrtnsch]

This adds support for the Azure Cosmos DB emulator. Unlike the existing module for Java, .NET, and Python, this implementation uses the new Linux emulator. The old emulator is very slow and cumbersome to work with, and using the new linux-based one seems like a decent tradeoff to make.

The container requires the mapped port to be passed as an env var. I have found a solution to achieve this, but it seems quite hacky to me. I'm very open to other ideas to solve this problem.

The port has to be passed, because CosmosDB provides redirects to the individual write/read endpoints. Those redirects then target the port passed in the env var, defaulting to 8081. The Azure Cosmos SDK client follows these redirects by default, leading to an ECONREFUSED if the port in the env is different than the mapped port.

This could be avoided by disabling endpoint discovery in the client like this:

const cosmosClient = new CosmosClient({
      endpoint: container.getEndpoint(),
      key: container.getKey(),
      connectionPolicy: {
        enableEndpointDiscovery: false,
      },
    });

However, this would force users of this testcontainer to specify different configurations depending on whether their client is running in prod or dev/test.

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