style: apply structpack & goimport (#469)

* refactor: reorder import statements in fetch.go and fetch_test.go

Signed-off-by: Jason Cameron <git@jasoncameron.dev>

* fix: optimize struct field alignment to reduce memory usage

Signed-off-by: Jason Cameron <git@jasoncameron.dev>

---------

Signed-off-by: Jason Cameron <git@jasoncameron.dev>

lib/policy/expressions/join_test.go

@@ -14,11 +14,11 @@ func TestJoin(t *testing.T) {
 	}
 
 	for _, tt := range []struct {
-		name      string
-		clauses   []string
-		op        JoinOperator
 		err       error
+		name      string
+		op        JoinOperator
 		resultStr string
+		clauses   []string
 	}{
 		{
 			name:    "no-clauses",