linter: Enable gofumpt and run against codebase (#1848)

* linter: Enable gofumpt and run against codebase

* Address shazbert's nits

* gofumpt: Fix issues after rebase

engine/engine_test.go

@@ -211,8 +211,9 @@ func TestUnloadExchange(t *testing.T) {
 	if !errors.Is(err, nil) {
 		t.Fatalf("received: '%v' but expected: '%v'", err, nil)
 	}
-	e := &Engine{ExchangeManager: em,
-		Config: &config.Config{Exchanges: []config.Exchange{{Name: testExchange}}},
+	e := &Engine{
+		ExchangeManager: em,
+		Config:          &config.Config{Exchanges: []config.Exchange{{Name: testExchange}}},
 	}
 	err = e.UnloadExchange("asdf")
 	if !errors.Is(err, config.ErrExchangeNotFound) {