Refactor wasm target and clarity-vm handling

[hugocaillard]

• Since Clarinet compiles to wasm, it use condtional compilation based in cargo features. Most of the work components expose a cli and wasm feature (clarity-repl/cli and clarity-repl/wasm), it leads to unnecessary complexity and should instead use conditional compilation based on the target
• clarity-repl re-exports clarity-vm modules, I leads to some confusion and difficult dependency management. Other crates should rely on the clarity crates instead (and less on clarity-repl)