Resolve anchors after parsing YAML

[ghost]

rapidyaml seems to choke on trees which contain anchors (or perhaps, strictly, references to them) when returning JSON.

To avoid this aggressively resolve anchors/references when parsing YAML into JSON and then into our own model.

Fixes #1162

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Prior to this patch, the test fails as reported in #1162 , with the fix it passes. I'm not sure if there is any perf penalty here or tbh if this is the canonical fix, but it seems to resolve the issue.

I have signed the personal contributor license agreement many years ago.

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[ghost]

Well i guess the CLA might be an issue; closing.

However, I the author of this work, grant anyone reading it a full license under Apachee 2.0 terms to reproduce it and contribute it to this project for the purposes of resolving the linked issue.