Support building midenc-compile for use in the browser

We'd like to use the Miden compiler in the Miden Playground, but to do so, we need to support building the compiler for the `wasm32-unknown-unknown` target.

The issue is about enabling the compiler to target WebAssembly for browser use. Start by examining the Cargo.toml for dependencies and target configuration, and look for existing build scripts. Research how to compile Rust to wasm32-unknown-unknown, focusing on removing any platform-specific code. Check for any existing WASM examples or tests in the repository. 'Done' means the compiler builds successfully for the WASM target and can be integrated into the Miden Playground.

Written by the indexing model from the issue text.