Test transition info

[gprashant17]

Added unit tests for TransitionInfo class inside runners.utils. A few things to note

1. The get_info method takes terminated and truncated as inputs along with agent. However, when I call the method in the unit test, it says that there are only two arguments - agent and done
2. In the get_stacked_state method, I am getting an error in this line:

   RLHive/hive/runners/utils.py

   Line 233 in 53f2087

   stacked_observation = concatenate(

   . I think there's an issue with concatenating.
3. Yet to write comments

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