Refactor Package structure

This commit cleans up the package structure, to make two new top-level
packages `internal` (for internal-use packages) and `pkg` (for general
shared utility code).

pkg/sqle/sqle.go

@@ -0,0 +1,10 @@
+package sqle
+
+import (
+	"github.com/feiin/sqlstring"
+)
+
+// Format formats the provided query with the given parameters.
+func Format(query string, params ...interface{}) string {
+	return sqlstring.Format(query, params...)
+}