FnOnce as Producer::send callback

[allevo]

send method should accept a FnOnce because the callback is invoked only once, after the error or ack from the server.
This PR implements the check on the type system.

NB: this is a breaking change

    // A non copy structure
    struct Foo;

    let f = Foo;
    producer
        .send(
            Message::builder().body(b"message".to_vec()).build(),
            move |_| {
                // this callback is an FnOnce, so we can drop a value here
                drop(f);
                async {}
            },
        )
        .await
        .unwrap();

Implementation details:
This PR uses an enum to store an OnceProducerMessageWaiter or a SharedProducerMessageWaiter. Only the latter is clonable.

Other:
update fake to 4

[codecov]

Codecov Report

Attention: Patch coverage is 84.05797% with 11 lines in your changes missing coverage. Please review.

Project coverage is 90.29%. Comparing base (1977a2c) to head (66cf308).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/producer.rs	82.75%	10 Missing ⚠️
protocol/src/message/amqp/types/primitives/map.rs	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #273      +/-   ##
==========================================
+ Coverage   90.28%   90.29%   +0.01%     
==========================================
  Files          80       80              
  Lines        7390     7390              
==========================================
+ Hits         6672     6673       +1     
+ Misses        718      717       -1     

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[wolf4ood]

LGTM 🚀

[Gsantomaggio]

Can we merge @DanielePalaia ?

[Gsantomaggio]

Thanks a lot @allevo and @wolf4ood