refactor(gin): migrate IP handling to net/netip package

[shirshendubhowmick]

Replaced usage of net.IP with net/netip

Key reasons (as per official go doc):

• Less memory footprint
• immutable
• comparable

In short it's more modern & better alternative than net.IP. The changes here are non breaking change and backward compatible.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.43%. Comparing base (3dc1cd6) to head (d27dab6).
⚠️ Report is 275 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4599      +/-   ##
==========================================
- Coverage   99.21%   98.43%   -0.78%     
==========================================
  Files          42       48       +6     
  Lines        3182     3133      -49     
==========================================
- Hits         3157     3084      -73     
- Misses         17       40      +23     
- Partials        8        9       +1     

Flag	Coverage Δ
	?
--ldflags="-checklinkname=0" -tags sonic	98.42% <100.00%> (?)
-tags go_json	98.29% <100.00%> (?)
-tags nomsgpack	98.34% <100.00%> (?)
go-1.18	?
go-1.19	?
go-1.20	?
go-1.21	?
go-1.25	98.43% <100.00%> (?)
go-1.26	98.37% <100.00%> (?)
macos-latest	98.37% <100.00%> (-0.85%)	⬇️
ubuntu-latest	98.43% <100.00%> (-0.78%)	⬇️

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