refactor: move more commands to internal/cmd (#207)

* refactor: move more commands to internal/cmd

Part of https://github.com/ooni/probe/issues/1335.

We would like all commands to be at the same level of engine
rather than inside engine (now that we can do it).

* fix: update .gitignore

* refactor: also move jafar outside engine

* We should be good now?

internal/engine/cmd/apitool/main_test.go

@@ -1,39 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"testing"
-)
-
-func init() {
-	*reportid = `20201209T052225Z_urlgetter_IT_30722_n1_E1VUhMz08SEkgYFU`
-	*input = `https://www.example.org`
-}
-
-func TestCheck(t *testing.T) {
-	*mode = "check"
-	main()
-}
-
-func TestRaw(t *testing.T) {
-	*mode = "raw"
-	main()
-}
-
-func TestMeta(t *testing.T) {
-	*mode = "meta"
-	main()
-}
-
-func TestInvalidMode(t *testing.T) {
-	defer func() {
-		if recover() == nil {
-			t.Fatal("the code did not panic")
-		}
-	}()
-	osExit = func(code int) {
-		panic(fmt.Errorf("%d", code))
-	}
-	*mode = "antani"
-	main()
-}