Preprocess WASM to import memory #10
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nearcore preprocesses WASM it's own way, so this code tries to match:
https://github.com/near/nearcore/blob/85563483db8f7655cbb45e856ba3fb99bbf463e3/runtime/near-vm-runner/src/prepare.rs#L143
This change allows to run WASM modules that don't export memory.
Binary format is manipulated directly, as otherwise is super slow (seconds) using
@webassemblyjs/wasm-edithttps://coinexsmartchain.medium.com/wasm-introduction-part-1-binary-format-57895d851580
Direct manipulation is more like 10-20 ms for 1MB WASM file.