Add run_id independent function to get the dependencies datat_type

[dachengx]

What is the problem / what does the code in this PR do

You can use st._get_plugins(targets=(data_type,), run_id=run_id) to get the dependencies of data_type, but this is too complicated, we need a simplified run_id independent function.

Can you briefly describe how it works?

Can you give a minimal working example (or illustrate with a figure)?

Please include the following if applicable:

• Update the docstring(s)
• Update the documentation
• Tests to check the (new) code is working as desired.
• Does it solve one of the open issues on github?

Please make sure that all automated tests have passed before asking for a review (you can save the PR as a draft otherwise).

[coveralls]

coverage: 90.274% (+0.02%) from 90.255%
when pulling dcce629 on add_get_dependencies
into d4964b6 on master.