Add YAML parsing support to WASM runtime #5785
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This PR implements two host functions that are exported to WASM mappings, allowing them to easily parse YAML documents.
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 #5772
AssemblyScript types are defined in graphprotocol/graph-tooling#1935
Tests
I have created and deployed a subgraph locally and tested the new host functions and all features/methods from graphprotocol/graph-tooling#1935
Todos