dns-route53: add --dns-route53-map

[alexzorin]

Fixes #9030. I noticed that this issue has come up again for a couple of users recently. There is no good workaround.

[bmw]

I don't love the (minor) added complexity for what feels like a fairly niche use case, but it may indeed be worth it and not be that niche if people keep hitting this.

I'm not super against this approach or anything, but I'm curious if you considered option (a) from #9030 (comment) and if so what you didn't like about it. If we did that, I think we may have to be careful about regressions so maybe we'd try to update every zone with same specificity, catching errors, and proceeding as long as at least one update succeeds, but it otherwise feels like that approach should just work for people and they wouldn't have to spend any time thinking about or configuring this for Certbot.

What do you think?

[alexzorin]

I agree that option (a) is clearly preferable. I can't remember why I chose otherwise. Thanks!