Replace encode_body with faster implementation based on f-string.

Benchmarks:

def encode_body(data):
    try:
        # Try to encode it regularly
        return data.encode()
    except AttributeError:
        # Convert it to a str if you can't
        return str(data).encode()

def encode_body2(data):
    return f"{data}".encode()

def encode_body3(data):
    return str(data).encode()

data_str, data_int = "foo", 123

%timeit encode_body(data_int)
928 ns ± 2.96 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each)

%timeit encode_body2(data_int)
280 ns ± 2.09 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each)

%timeit encode_body3(data_int)
387 ns ± 1.7 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each)

%timeit encode_body(data_str)
202 ns ± 1.9 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each)

%timeit encode_body2(data_str)
197 ns ± 0.507 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)

%timeit encode_body3(data_str)
313 ns ± 1.28 ns per loop (mean ± std. dev. of 7 runs, 1000000 loops each)

sanic/response.py

@@ -23,12 +23,7 @@ except BaseException:
 
 class BaseHTTPResponse:
     def _encode_body(self, data):
-        try:
-            # Try to encode it regularly
-            return data.encode()
-        except AttributeError:
-            # Convert it to a str if you can't
-            return str(data).encode()
+        return f"{data}".encode()
 
     def _parse_headers(self):
         return format_http1(self.headers.items())