Add a way to acknowledge a message only with Id

[zamazan4ik]

Hi.

Right now library provides a way to acknowledge a message with the following function: https://docs.rs/pulsar/latest/pulsar/consumer/struct.Consumer.html#method.ack

As you see, it consumes the whole Message as a ref. However, internally it uses only an Id field. During the integration of acknowledgment mechanism into Vector I have found that would be much more convenient to have a way just to pass an id instead of the whole message (at least because Message does not support Clone).

Could you please change the corresponding method (would be a breaking change, I guess) or provide an additional method smth like ack_with_message_id to resolve the problem? Thanks!

P.S. Yeah, I know that I can grab acker and emulate the same behavior with it. I think having ack_with_message_id has better UX for the users.

[zamazan4ik]

Oh, acker is not visible outside the crate :( Could you please make acker just pub please? :)

[zamazan4ik]

And I have some more ideas for the API:

• make Message cloneable, if it's possible
• implement Debug for Message and Consumer

[fmassot]

@zamazan4ik It may be fixed by the merged PR #252 from @ChillFish8

Can you check and close if it satisfies your needs?