Add OPT_ASSOC for roundtrip serialization of map.

[ranvis]

Since PHP has no real array, unpacking both array and map into array() can cause loss of information.
The patch adds OPT_ASSOC = false option to support roundtrip serialization of map by packing stdClass into map and vice versa like json_encode/decode() does.
This will improve compatibility a bit with data generated by other langauge bindings, while preserving the previous behavior when OPT_ASSOC = true (default).
Related to #18 #45

[doc987]

It looks like this was never updated. Is there another way to deserialze to an object instead of an associative array?

[m6w6]

Hi! Thanks for your submission.

Please rebase this PR, so we can have a closer look!

[ranvis]

Done.

[codecov-io]

Codecov Report

Merging #58 into master will increase coverage by 0.17%.
The diff coverage is 92.3%.

@@            Coverage Diff             @@
##           master      #58      +/-   ##
==========================================
+ Coverage   85.79%   85.97%   +0.17%     
==========================================
  Files           8        8              
  Lines        1345     1369      +24     
==========================================
+ Hits         1154     1177      +23     
- Misses        191      192       +1

Impacted Files	Coverage Δ
msgpack_pack.c	94.42% <100%> (+0.04%)	⬆️
msgpack_unpack.c	82.76% <100%> (+0.35%)	⬆️
msgpack.c	93.33% <100%> (+0.12%)	⬆️
msgpack_class.c	87.55% <88.88%> (+0.12%)	⬆️

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[ranvis]

usage:

$msgpack = new MessagePack();
$msgpack->setOption(MessagePack::OPT_PHPONLY, false);
$msgpack->setOption(MessagePack::OPT_ASSOC, false);
$data = [0 => 1, 1 => 2, 2 => 3];
var_dump(bin2hex($msgpack->pack($data)));
// string(8) "93010203"
var_dump(bin2hex($msgpack->pack((object)$data)));
// string(20) "83a13001a13102a13203"

[taka-oyama]

@m6w6 Is this still considered?
I would love to have this feature implemented so the outcome is aligned with json!

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 92.30769% with 2 lines in your changes missing coverage. Please review.

Project coverage is 85.97%. Comparing base (7eb85f2) to head (6b1845a).
Report is 131 commits behind head on master.

Files	Patch %	Lines
msgpack_class.c	88.88%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #58      +/-   ##
==========================================
+ Coverage   85.79%   85.97%   +0.17%     
==========================================
  Files           8        8              
  Lines        1345     1369      +24     
==========================================
+ Hits         1154     1177      +23     
- Misses        191      192       +1     

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