Change wasm package name

[whylee259]

Summary

Replacing package name does not apply to the final referrer, so the final referrer (e.g. lbm) must copy the replace of all referencing packages.
This can lead to unintended version conflicts.

It would be better the use our own package name for the forked repo rather than use replace.

Problem Definition

Proposal

Change the wasmvm package name.
github.com/CosmWasm/wasmvm → github.com/line/wasmvm

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