feat: support parse number as raw

[liuq19]

To maintain the lossless, support parse number as raw json instead of float or integer.

If you want parse numbers as raw number, can use doc.template Parse<kParseRawNumber>(json).

Proposal : #61

[codecov-commenter]

Codecov Report

Merging #60 (f7a2b98) into master (50514ec) will increase coverage by 0.03%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##           master      #60      +/-   ##
==========================================
+ Coverage   95.88%   95.92%   +0.03%     
==========================================
  Files          21       21              
  Lines        2431     2427       -4     
==========================================
- Hits         2331     2328       -3     
+ Misses        100       99       -1     

Impacted Files	Coverage Δ
include/sonic/dom/dynamicnode.h	96.08% <100.00%> (ø)
include/sonic/dom/genericnode.h	99.63% <100.00%> (ø)
include/sonic/dom/handler.h	100.00% <100.00%> (+0.95%)	⬆️
include/sonic/dom/parser.h	94.23% <100.00%> (ø)

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[xiegx94]

DNode(const DNode<SourceAllocator>& rhs, Allocator& alloc, bool copyString = false)
operator==(const DNode<SourceAllocator>& rhs)
destroy()
Above functions need process when type is kRawNumber. Also kRaw

[liuq19]

kRawNumber suppprt construct，copy and compare