Add YAML parsing support to mappings #1935
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This PR adds type definitions for two host functions that parse YAML documents and defines some helper methods to make working with YAML types nicer.
The main use case for this feature is to parse subgrah manifests, but it is flexible enough to allow parsing any YAML document.
Part of graphprotocol/graph-node#5772
Host functions are implemented in graphprotocol/graph-node#5785
Tests
I have created and deployed a subgraph to a local graph-node with changes from graphprotocol/graph-node#5785 and tested all new features/methods from this PR.