Add wasm compilation target

[Avey777]

For better portability, we hope to provide the deployment file of wasm

[Kerollmops]

Hey @Avey777,

Could it be possible to explain to us what's your use case?
Are you aware that Meilisearch runs on top of LMDB and that the whole engine uses the file system?
If so, do you want to use a wasi interface to make it compile correctly?

[Avey777]

Just want to have this option, no more usage scenarios