node: Add 'get_str_list' on 'MappingNode'

Benjamin Schubertrequested to merge
bschubert/api-improvements into master

Description

mapping.get_sequence(...).as_str_list() is a very common pattern. Providing a helper to do both operations in a single go makes things easier for plugin developers.

Changes proposed in this merge request:

  • Add get_str_list on 'MappingNode'

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