feat: add Diff feature to gmap

[LonelySally]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.06 🎉

Comparison is base (41c0dde) 79.13% compared to head (76644b9) 79.19%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2774      +/-   ##
==========================================
+ Coverage   79.13%   79.19%   +0.06%     
==========================================
  Files         632      632              
  Lines       52014    52137     +123     
==========================================
+ Hits        41161    41291     +130     
+ Misses       8820     8809      -11     
- Partials     2033     2037       +4     

Flag	Coverage Δ
go-1.15-386	79.22% <100.00%> (+0.06%)	⬆️
go-1.15-amd64	79.21% <100.00%> (+0.09%)	⬆️
go-1.16-386	79.21% <100.00%> (+0.06%)	⬆️
go-1.16-amd64	79.20% <100.00%> (+0.06%)	⬆️
go-1.17-386	79.23% <100.00%> (+0.10%)	⬆️
go-1.17-amd64	79.21% <100.00%> (+0.09%)	⬆️
go-1.18-386	78.83% <100.00%> (+0.07%)	⬆️
go-1.18-amd64	78.80% <100.00%> (+0.03%)	⬆️
go-1.19-386	79.20% <100.00%> (+0.06%)	⬆️
go-1.19-amd64	?
go-1.20-386	79.21% <100.00%> (+0.08%)	⬆️
go-1.20-amd64	79.22% <100.00%> (+0.11%)	⬆️

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Impacted Files	Coverage Δ
container/gmap/gmap_hash_any_any_map.go	96.54% <100.00%> (+0.17%)	⬆️
container/gmap/gmap_hash_int_any_map.go	95.70% <100.00%> (+0.22%)	⬆️
container/gmap/gmap_hash_int_int_map.go	90.72% <100.00%> (+0.48%)	⬆️
container/gmap/gmap_hash_int_str_map.go	93.91% <100.00%> (+0.31%)	⬆️
container/gmap/gmap_hash_str_any_map.go	98.20% <100.00%> (+0.09%)	⬆️
container/gmap/gmap_hash_str_int_map.go	95.37% <100.00%> (+0.23%)	⬆️
container/gmap/gmap_hash_str_str_map.go	95.53% <100.00%> (+0.23%)	⬆️

... and 6 files with indirect coverage changes

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