Project fails to build due to wasm-demo crate

[fmoletta]

Describe the bug
The wasm-demo crate imports a compiled json file using include_bytes macro, causing its build to fail if the file is not present. This causes the build target to fail.

To Reproduce
1- Clone the repo
2- Run make deps/make deps-macos (Optional)
3- Run make build
4- See error

cargo build --release
   Compiling wasm-demo v0.8.6 (/Users/federica/cairo-vm/examples/wasm-demo)
error: couldn't read examples/wasm-demo/src/./array_sum.json: No such file or directory (os error 2)
  --> examples/wasm-demo/src/lib.rs:30:33
   |
30 |     const PROGRAM_JSON: &[u8] = include_bytes!("./array_sum.json");
   |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: this error originates in the macro `include_bytes` (in Nightly builds, run with -Z macro-backtrace for more info)

Expected behavior
Running make build should build the repo without failing

What version/commit are you on?
commit 2d214f7
(After v0.8.6)

Additional context
Compiling cairo files shouldn't be a prerequisite to build the project