Refactor MessagePack serialization backend to remove msgpack-d dependency

[hatf0]

This PR will fully remove the dependency on msgpack-d for the serialization backend. All features should be implemented (and are verified to be correct with the upstream MessagePack spec).

Let me know if this needs any more work! Thanks.

[codecov-commenter]

Codecov Report

Merging #4 (87c352e) into master (a1a0abe) will increase coverage by 0.56%. The diff coverage is 99.15%.

@@            Coverage Diff             @@
##           master       #4      +/-   ##
==========================================
+ Coverage   84.88%   85.45%   +0.56%     
==========================================
  Files          31       32       +1     
  Lines        6624     6902     +278     
==========================================
+ Hits         5623     5898     +275     
- Misses       1001     1004       +3     

Impacted Files	Coverage Δ
source/mir/ion/ser/msgpack.d	98.91% <99.15%> (ø)
source/mir/ion/deser/json.d	84.21% <0.00%> (ø)
source/mir/ion/ser/package.d	96.72% <0.00%> (+0.01%)	:arrow_up:

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[hatf0]

Do not merge yet -- I have to refactor some bits and pull out the usage of ScopedBuffer (as it's now going out of scope and causing a use after free)

[9il]

Please add extra 4 spaces for the whole MsgpackSerializer. And use the same order of methods like in the original code. That is needed to reduce the diff for easier review.

[9il]

We need 100% coverage of the new code for the message pack. It is a critical part of code used in production.

[hatf0]

We need 100% coverage of the new code for the message pack. It is a critical part of code used in production.

@9il, I was able to get coverage up to 98% on this file, if that's fine. The only code that isn't covered is: https://github.com/libmir/mir-ion/blob/f143764fc10701beda287f72cc38eec0042f5b8a/source/mir/ion/ser/msgpack.d#L572-L575 https://github.com/libmir/mir-ion/blob/f143764fc10701beda287f72cc38eec0042f5b8a/source/mir/ion/ser/msgpack.d#L537-L540 Both of these aren't feasible to test (as they'd require that we allocate a const(char)[] array that is 4.29 GB in size) https://github.com/libmir/mir-ion/blob/f143764fc10701beda287f72cc38eec0042f5b8a/source/mir/ion/ser/msgpack.d#L317-L318 and I'm not sure how to trigger this code path.

[9il]

@9il, I was able to get coverage up to 98% on this file, if that's fine. The only code that isn't covered is:

That is enough, thank you

[hatf0]

Alright. I've added your requested fixes -- let me know if there's anything else that need fixing.

[9il]

Looks good.