Use `escape` on the body in `@httpRequestTest` protocol test generation (#1949)

                // corresponding Unicode code point. That is the "form feed" 0x0c character. When printing it,

                // it gets written as "\f", which is an invalid Rust escape sequence: https://static.rust-lang.org/doc/master/reference.html#literals

                // So we need to write the corresponding Rust Unicode escape sequence to make the program compile.

                "#{SmithyHttpServer}::body::Body::from(#{Bytes}::from_static(${

                body.replace("\u000c", "\\u{000c}").dq()

                }.as_bytes()))"

                //

                // We also escape to avoid interactions with templating in the case where the body contains `#`.

                val sanitizedBody = escape(body.replace("\u000c", "\\u{000c}")).dq()

                "#{SmithyHttpServer}::body::Body::from(#{Bytes}::from_static($sanitizedBody.as_bytes()))"

            } else {

                "#{SmithyHttpServer}::body::Body::empty()"

            }