Allow decoding raw strings

[jasonpaulos]

This PR adds the ability to skip UTF-8 decoding of strings when you enable the rawStrings decoding option.

This is useful because I have encountered some encoded msgpack strings which do not contain valid UTF-8 data, and without a feature like this, it would be impossible to decode them properly.

According to the msgpack spec, this ability is encouraged:

• String objects may contain invalid byte sequence and the behavior of a deserializer depends on the actual implementation when it received invalid byte sequence
  • Deserializers should provide functionality to get the original byte array so that applications can decide how to handle the object

[jannotti]

Why not do this for map keys as well?

[jasonpaulos]

This library doesn't support binary keys, so I decided to skip that case.

[gfx]

No, it doesn't. Sounds a good decision.

[gfx]

Sorry for the delayed response. Thanks for your contribution. LGTM.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.07%. Comparing base (3783cf4) to head (3b6ef80).
Report is 25 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #235      +/-   ##
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- Coverage   98.55%   98.07%   -0.48%     
==========================================
  Files          16       16              
  Lines        1037     1092      +55     
  Branches      200      249      +49     
==========================================
+ Hits         1022     1071      +49     
- Misses         15       21       +6     

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