feat(testcontainers): Add a working testcontainers implementation (#3)

* feat(testcontainers): Add a working testcontainers implementation

This commit adds a first implementation of the testcontainers support that covers basically all of the compliance tests.
The get_client() method is still commented out, as the client itself is not yet implemented as testing the client depends on this being merged.

Signed-off-by: Raphael Höser <[email protected]>

* chore(testcontainers): Add documentation to the container feature

Signed-off-by: Raphael Höser <[email protected]>

* fix(testcontainers): remove is_running method from testcontainers

Signed-off-by: Raphael Höser <[email protected]>

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Signed-off-by: Raphael Höser <[email protected]>

Author: Snapstromegon