Add DeploymentStepDriverBase & DeploymentStepFieldsDriverBase

[hishamco]

• Reduce the code boilerplate for both the deployment step driver & deployment step fields driver
• No more magic strings for deployment steps shapes

[MikeAlhayek]

@hishamco I don't think this is a good idea and may add more things to learn for no added value.

[hishamco]

why there's no value, most of the time lost in a typo in a shape name during the deployment, please keep this open for now and I might open another PR to avoid magic strings at least. Then we can have a choice to keep it or break it

[MikeAlhayek]

Because it hide too much details and it's hard to understand what is happening with the code. The logic in drivers should be visible so have full control and full visibility on what the code does.