Clean up vm entry points

[DimitrisJim]

Description

Does a couple of things that seemed sensible to me:

• Move wasmQuery and wasmCall into vm, these are shared across files and them being in client_state mostly served to making me struggle to remember where they were.
• any -> Concrete type.
• Add wasmInit in a similar vein. Now all wasm* functions take the concrete msg, marshal it, call into their own respective functions and then handle the error.

closes: #XXXX

Commit Message / Changelog Entry

chore: normalize internal api for calling/querying contracts.

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[damiannolan]

lgtm!

[crodriguezvega]

Nice! 👍