feat(miniooni): make CLI much more user friendly (#913)

Part of https://github.com/ooni/probe/issues/2184, because I wanted
to allow swapping commands and options more freely.

As a side effect, this PR closes https://github.com/ooni/probe/issues/2248.

AFAICT, every usage that was legal before is still legal. What has
changed seems the freedom to swap commands and options and a much
better help that lists the available options.

internal/cmd/miniooni/runx.go

@@ -13,7 +13,7 @@ import (
 
 // runx runs the given experiment by name
 func runx(ctx context.Context, sess oonirun.Session, experimentName string,
-	annotations map[string]string, extraOptions map[string]any, currentOptions Options) {
+	annotations map[string]string, extraOptions map[string]any, currentOptions *Options) {
 	desc := &oonirun.Experiment{
 		Annotations:    annotations,
 		ExtraOptions:   extraOptions,