Add timestamp field to Object.Vector

[ykadowak]

Description:

This PR adds timestamp field to Object.Vector. This is a preparation for the index correction feature.

Related Issue:

Versions:

• Go Version: 1.20.6
• Docker Version: 20.10.8
• Kubernetes Version: v1.27.3
• NGT Version: 2.0.16

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:

[cloudflare-pages]

Deploying with    Cloudflare Pages

Latest commit:	9d6458e
Status:	✅  Deploy successful!
Preview URL:	https://53683fbb.vald.pages.dev
Branch Preview URL:	https://feature-add-timestamp.vald.pages.dev

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[codecov]

Codecov Report

Patch coverage: 83.87% and project coverage change: +0.03% 🎉

Comparison is base (6f5fb18) 31.09% compared to head (37ce629) 31.12%.
Report is 2 commits behind head on main.

❗ Current head 37ce629 differs from pull request most recent head 9d6458e. Consider uploading reports for the commit 9d6458e to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2136      +/-   ##
==========================================
+ Coverage   31.09%   31.12%   +0.03%     
==========================================
  Files         339      339              
  Lines       32831    32834       +3     
==========================================
+ Hits        10210    10221      +11     
+ Misses      22169    22161       -8     
  Partials      452      452              

Files Changed	Coverage Δ
pkg/agent/core/ngt/service/ngt.go	36.83% <76.19%> (+1.02%)	⬆️
pkg/agent/core/ngt/handler/grpc/object.go	55.33% <100.00%> (+0.29%)	⬆️
pkg/agent/core/ngt/service/kvs/kvs.go	84.52% <100.00%> (ø)
pkg/agent/core/ngt/service/vqueue/queue.go	72.78% <100.00%> (ø)

... and 2 files with indirect coverage changes

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