Revert "tune default params (#2100)" and add Go module

[kpango]

This reverts commit a46ac9e.

Description:

Related Issue:

Versions:

• Go Version: 1.20.5
• Docker Version: 20.10.8
• Kubernetes Version: v1.27.3
• NGT Version: 2.0.13

Checklist:

• I have read the CONTRIBUTING document and completed our CLA agreement.
• I have checked open Pull Requests for the similar feature or fixes?

Special notes for your reviewer:

[vdaas-ci]

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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.03 ⚠️

Comparison is base (a6d8701) 30.65% compared to head (2729c1b) 30.63%.

❗ Current head 2729c1b differs from pull request most recent head 38d60ab. Consider uploading reports for the commit 38d60ab to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2111      +/-   ##
==========================================
- Coverage   30.65%   30.63%   -0.03%     
==========================================
  Files         347      347              
  Lines       34255    34255              
==========================================
- Hits        10501    10494       -7     
- Misses      23276    23283       +7     
  Partials      478      478              

Impacted Files	Coverage Δ
pkg/gateway/lb/handler/grpc/aggregation.go	0.00% <ø> (ø)

... and 3 files with indirect coverage changes

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