chore: import upstream snapshot with attribution

scripts/check_fmt.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+set -eo pipefail
+
+script_dir=$(dirname "$0")
+cd $script_dir/..
+
+go install golang.org/x/tools/cmd/goimports
+
+paths=`find . -maxdepth 1 -mindepth 1 ! -name ".idea" ! -name ".git" ! -name ".github" \( -name gen -prune -o -type d -print -o -type f -name '*.go' -print \)`
+
+bad_files=$(goimports -l -local github.com/dolthub/doltgresql $paths)
+if [ "$bad_files" != "" ]; then
+    echo "ERROR: The following files do not match goimports output:"
+    echo "$bad_files"
+    echo
+    echo "Please format the go code in the repository with './scripts/format_repo.sh'"
+    exit 1
+fi
+
+bad_files=$(find $paths -name '*.go' | while read f; do
+    if [[ $(awk '/import \(/{flag=1;next}/\)/{flag=0}flag' < $f | egrep -c '$^') -gt 2 ]]; then
+        echo $f
+    fi
+done)
+
+if [ "$bad_files" != "" ]; then
+    echo "ERROR: The following files have more than three import groups:"
+    echo "$bad_files"
+    echo
+    echo "Please format the go code in the repository with './scripts/format_repo.sh'"
+    exit 1
+fi