Optimized SIP response code parsing.

[Dimi1010]

Optimized the SIP response code parsing to utilize a switch(uint16_t) instead of an unordered_map<std::string, ...>.

Benchmark comparison.

UMap is the original code.
Packed4 uses the pack4 function.
C2UINT16 is the current parseStatusCodePure implementation.

Run on (16 X 4700 MHz CPU s)
CPU Caches:
  L1 Data 48 KiB (x8)
  L1 Instruction 32 KiB (x8)
  L2 Unified 1024 KiB (x8)
  L3 Unified 98304 KiB (x1)
-----------------------------------------------------
Benchmark           Time             CPU   Iterations
-----------------------------------------------------
UMap             15.1 ns         15.0 ns     44800000
Packed4          2.77 ns         2.76 ns    248888889
C2UINT16         2.58 ns         2.62 ns    280000000

[codecov]

Codecov Report

❌ Patch coverage is 96.06557% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.46%. Comparing base (5c11564) to head (f52a555).
⚠️ Report is 1 commits behind head on dev.

Files with missing lines	Patch %	Lines
Packet++/src/SipLayer.cpp	96.38%	6 Missing and 5 partials ⚠️
Packet++/header/SipLayer.h	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #2041      +/-   ##
==========================================
+ Coverage   83.44%   83.46%   +0.01%     
==========================================
  Files         312      312              
  Lines       54741    54850     +109     
  Branches    11847    11819      -28     
==========================================
+ Hits        45681    45781     +100     
+ Misses       8238     7818     -420     
- Partials      822     1251     +429     

Flag	Coverage Δ
alpine320	75.96% <92.93%> (+0.09%)	⬆️
fedora42	75.53% <93.44%> (+0.11%)	⬆️
macos-14	81.49% <90.78%> (-0.03%)	⬇️
macos-15	81.48% <90.78%> (-0.03%)	⬇️
mingw32	70.13% <92.17%> (+0.27%)	⬆️
mingw64	70.10% <92.17%> (+0.38%)	⬆️
npcap	?
rhel94	75.41% <56.00%> (-0.03%)	⬇️
ubuntu2004	59.43% <36.00%> (-0.03%)	⬇️
ubuntu2004-zstd	59.53% <36.00%> (-0.03%)	⬇️
ubuntu2204	75.38% <56.00%> (+<0.01%)	⬆️
ubuntu2204-icpx	58.07% <44.23%> (+0.35%)	⬆️
ubuntu2404	75.59% <92.93%> (+0.09%)	⬆️
ubuntu2404-arm64	75.64% <92.93%> (+0.09%)	⬆️
unittest	83.46% <96.06%> (+0.01%)	⬆️
windows-2022	85.40% <94.68%> (+0.18%)	⬆️
windows-2025	85.43% <94.68%> (+0.14%)	⬆️
winpcap	85.43% <94.68%> (-0.06%)	⬇️
xdp	53.00% <56.00%> (-0.01%)	⬇️

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