update go.mod module version to /v2

[suchen-sci]

Update go.mod module path to v2, so we can go get "github.com/megaease/easegress/v2".

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.07 🎉

Comparison is base (3904080) 81.56% compared to head (59d2b1b) 81.64%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1045      +/-   ##
==========================================
+ Coverage   81.56%   81.64%   +0.07%     
==========================================
  Files         135      135              
  Lines       15121    15121              
==========================================
+ Hits        12334    12345      +11     
+ Misses       2228     2217      -11     
  Partials      559      559              

Impacted Files	Coverage Δ
pkg/cluster/cluster.go	61.15% <ø> (ø)
pkg/cluster/cluster_interface.go	100.00% <ø> (ø)
pkg/cluster/config.go	94.82% <ø> (ø)
pkg/cluster/customdata/customdata.go	74.30% <ø> (ø)
pkg/cluster/member.go	70.81% <ø> (ø)
pkg/cluster/syncer.go	88.46% <ø> (ø)
pkg/cluster/test_util.go	94.11% <ø> (ø)
pkg/cluster/watcher.go	100.00% <ø> (ø)
pkg/filters/builder/builder.go	100.00% <ø> (ø)
pkg/filters/builder/databuilder.go	79.06% <ø> (ø)
... and 85 more

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