Add level in the tree when drawing dependency tree

[dachengx]

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This is a follow-up PR of AxFoundation/strax#896

What does the code in this PR do / what does it improve?

It will print the level and order of a data_type in a tree if include_level=True.

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?

Notes on testing

• Until the automated tests pass, please mark the PR as a draft.
• On the XENONnT fork we test with database access, on private forks there is no database access for security considerations.

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[coveralls]

coverage: 89.768% (-0.004%) from 89.772%
when pulling 3553607 on add_level_to_tree
into 9d2a6b6 on master.