[Feature Request]: Support YAML data structure unmarshal

[rytswd]

🔮 Relevant Command

importer update, importer generate

🗂 Language Type

YAML

🔎 Request Details

Having exporter markers are explicit ways of making some parts of the file easy to import, but it can be a bit repetitive and noisy, where YAML does have the clear data structure to pinpoint the dataset.

Importer can add an extra feature for YAML files to support dotted notation to pull in the exact stanza - this may be challenging for multi-document YAMLs, but it should be doable.

This is probably better to separate from the main Importer code base, and have it as a separate plugin, as there could be other languages that could use the same logic.