Add wasm-runtime as a dependency and find it using cargo-metadata

[jprendes]

This PR adds wasm-runtime as a dependency of hyperlight-wasm.
Then, for building it in the hyperlight-wasm buildscript, find its location using cargo metadata.

This PR has 2 main parts>

• Split wasm-runtime into a lib that hyperlight-wasm can depend on (i.e., a lib that can fuild for x86_64-unknown-linux-gnu) and a binary that hyperlight can build.
• Add wasm-runtime as a dependency, and modify the build script to find it.

Out of scope:

• Making the wasm-runtime library useful outside of hyperlight uses (e.g., making it useful for native workflows like we did with hyperlight-js).
• Making a native binary for wasm-runtime (this is a consecuence of the previous)

These are out of scope as currently the macros have baked in assumptions aobut hyperlight.

Remaining work (for other PRs)

• Rename wasm-runtime -> hyperlight-wasm-runtime
• remove vendor.tar from CI workflows and Justfile

[dblnz]

LGTM!
Beside the other benefits, this change makes debugging static languages a lot simpler by having a predictable path for wasm_runtime binary that needs to be provided to GDB/LLDB.