snip line/col info from templates in release

[jkelleyrtp]

Feature Request

Pulled from #2365

Use the hash of the template and don't include its contents when building for release under some circumstances.

This prevents us from leaking filepaths into applications for privacy/security reasons.

                // If this is a release build, strip the location out of the template for smaller binaries and so we don't leak that information
                #[cfg(not(debug_assertions))]
                return {
                    use std::hash::{Hash, Hasher};
                    let mut hasher = std::collections::hash_map::DefaultHasher::new();
                    if let Some(first) = self.roots.first() {
                        first.hash(&mut hasher);
                    }
                    let hash = hasher.finish();
                    let lit_str =
                        syn::LitStr::new(&format!("{hash}"), proc_macro2::Span::call_site());
                    quote! { #lit_str }
                };