change grpc bidi-stream error handling and change grpc API interface

[kpango]

Signed-off-by: kpango kpango@vdaas.org

Description:

change grpc bidi-stream error handling and change grpc API interface for more informative payload for each stream response

Related Issue:

How Has This Been Tested?:

Environment:

• Go Version: 1.15.2
• Docker Version: 19.03.8
• Kubernetes Version: 1.18.2
• NGT Version: 1.12.1

Types of changes:

• Bug fix [type/bug]
• New feature [type/feature]
• Add tests [type/test]
• Security related changes [type/security]
• Add documents [type/documentation]
• Refactoring [type/refactoring]
• Update dependencies [type/dependency]
• Update benchmarks and performances [type/bench]
• Update CI [type/ci]

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?

Checklist:

• I have read the CONTRIBUTING document.
• I have checked open Pull Requests for the similar feature or fixes?
• I have added tests and benchmarks to cover my changes.
• I have ensured all new and existing tests passed.
• I have commented my code, particularly in hard-to-understand areas
• I have updated the documentation accordingly.

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[codecov]

Codecov Report

Merging #928 (22c11b2) into master (a43f8f7) will increase coverage by 0.10%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #928      +/-   ##
==========================================
+ Coverage   16.20%   16.30%   +0.10%     
==========================================
  Files         472      470       -2     
  Lines       23158    23075      -83     
==========================================
+ Hits         3752     3763      +11     
+ Misses      19171    19072      -99     
- Partials      235      240       +5     

Impacted Files	Coverage Δ
internal/net/grpc/addrs.go	0.00% <0.00%> (ø)
internal/net/grpc/status/status.go	0.00% <0.00%> (ø)
internal/net/grpc/stream.go	0.00% <0.00%> (ø)
pkg/agent/core/ngt/handler/grpc/handler.go	0.00% <0.00%> (ø)
pkg/gateway/backup/handler/grpc/handler.go	0.00% <0.00%> (ø)
pkg/gateway/lb/handler/grpc/handler.go	0.00% <0.00%> (ø)
pkg/gateway/meta/handler/grpc/handler.go	0.00% <0.00%> (ø)
internal/db/storage/blob/s3/reader/reader.go	63.04% <0.00%> (-31.53%)	⬇️
internal/worker/queue.go	95.00% <0.00%> (-5.00%)	⬇️
internal/errgroup/group.go	92.42% <0.00%> (-1.52%)	⬇️
... and 5 more

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