Embed metadata into the wasm binary

[pepyakin]

#7327 and #8688 were about embedding the version information into the wasm binary. We can leverage the same technique for the metadata.

That would enable a simpler way to get the metadata. The user will need to only obtain the wasm binary and then fetch a specific section. No instantiation of the wasm runtime is required.

[stale]

Hey, is anyone still working on this? Due to the inactivity this issue has been automatically marked as stale. It will be closed if no further activity occurs. Thank you for your contributions.