🔧 Separate format and lint scripts (#232)

scripts/format.sh

@@ -0,0 +1,6 @@
+#!/bin/sh -e
+set -x
+
+autoflake --remove-all-unused-imports --recursive --remove-unused-variables --in-place docs/src/ fastapi tests --exclude=__init__.py
+black fastapi tests docs/src
+isort --multi-line=3 --trailing-comma --force-grid-wrap=0 --combine-as --line-width 88 --recursive --thirdparty fastapi --apply fastapi tests docs/src