Feature: dependsOn functionality for DockerContainer

[mgorsk1]

What are you trying to do?

Improve TC-python feature parity with TC-java by enabling container to specify dependsOn, which should work similar to how depends_on in docker-compose does - container B that depends on container A won't be started until container A is in running state.

Why should it be done this way?

Control order/behavior for container startup in multi-container scenarios.

Other references:

Include any other relevant reading material about the enhancement.

[hari134]

I have implemented the depends_on functionality for DockerContainer, mirroring the dependsOn behavior in TC-java so that dependent containers only start once their dependencies are in the running state. The PR for this enhancement is now open: #728. Please check it out, and let me know if any changes are needed.