add std feature for cairo1-run

Author: FrancoGiachetta

cairo1-run/Cargo.toml

@@ -29,4 +29,6 @@ num-bigint.workspace = true
 getrandom = { version = "0.2.16", features = ["js"]}
 
 [features]
+default = ["std"]
 mod_builtin = ["cairo-vm/mod_builtin"]
+std = ["cairo-vm/std"]

examples/wasm-demo-cairo1/Cargo.toml

@@ -28,4 +28,4 @@ serde_json ={ workspace = true }
 
 cairo-lang-sierra = { workspace = true }
 cairo-vm = { workspace = true }
-cairo1-run = { workspace = true }
+cairo1-run = { workspace = true, default-features = false }