[Breaking change] Fix calling Records::encode / Records::decode with None

[rukai]

Calling encode or decode with the correct compression automatically chosen is very difficult. Providing None results in an error like this:

 1  error[E0283]: type annotations needed
    --> kafka-fetch-rewrite/src/lib.rs:87:88
     |
 87  | ...                   RecordBatchDecoder::decode(&mut records_bytes.clone(), None)
     |                       --------------------------                             ^^^^ cannot infer type of the type parameter `T` declared on the enum `Option`
     |                       |
     |                       required by a bound introduced by this call
     |
     = note: multiple `impl`s satisfying `for<'a> _: Fn(&'a mut bytes::Bytes, kafka_protocol::records::Compression)` found in the following crates: `alloc`, `core`:
             - impl<A, F> std::ops::Fn<A> for &F
               where A: std::marker::Tuple, F: std::ops::Fn<A>, F: ?Sized;
             - impl<Args, F, A> std::ops::Fn<Args> for std::boxed::Box<F, A>
               where Args: std::marker::Tuple, F: std::ops::Fn<Args>, A: std::alloc::Allocator, F: ?Sized;
 note: required by a bound in `kafka_protocol::records::RecordBatchDecoder::decode`
    --> /home/rukai/.cargo/registry/src/index.crates.io-6f17d22bba15001f/kafka-protocol-0.13.0/src/records.rs:495:12
     |
 493 |     pub fn decode<B: ByteBuf, F>(buf: &mut B, decompressor: Option<F>) -> Result<Vec<Record>>
     |            ------ required by a bound in this associated function
 494 |     where
 495 |         F: Fn(&mut bytes::Bytes, Compression) -> Result<B>,
     |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `RecordBatchDecoder::decode`
 help: consider specifying the generic argument
     |
 87  |                                 RecordBatchDecoder::decode(&mut records_bytes.clone(), None::<T>)
     |                                                                                            +++++

For which the fix is to change the None to None::<fn(&mut bytes::Bytes, Compression) -> Result<Bytes>>.
This is a pretty poor experience.

To fix this I am making decode/encode provide the correct None value, and have the original implementation moved to decode_with_custom_compression/encode_with_custom_compression.

@pdeva heads up that you will want to adjust your project to call decode_with_custom_compression instead of decode.

[davide-baldo]

It's not just a poor experience, without anyhow you can't even match the signature.

I was wrong, you can actually use _ :)

[rukai]

@tychedelia This PR is a very clear improvement to usability so I'll merge it tomorrow unless I hear back otherwise.

[tychedelia]

Thanks @rukai. That's pretty gnarly and should have been caught in review. I still think expanding our support for compression is a good idea and so much prefer this wrapping solution.

[tychedelia]

Would be nice to have a test covering the new wrapped version but not a big deal.