fix: dockerfile and example fixes

Set PATH to include Rust tools in standalone shell
In install-wit-bindgen.sh, the WIT_BINDGEN_REVISION had a #... suffix at the end, which was causing the cargo install command to fail
Removed the -s option from example CPP Makefiles so that symbols don't get stripped out
Regenerated the split CPP example since the Canonical ABI changed since it was originally created.

singlestore-labs / singlestore-wasm-toolkit