feat: dead letter

[xdlbdy]

What problem does this PR solve?

Issue Number: close #xxx

Problem Summary

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• create eventbus
  vsctl eventbus create eventbus --name quick-start
• create subscription

vsctl subscription create \
--name quick-start \
--eventbus quick-start \
--sink 'http://localhost:18080' \
--ordered-event

• put event

vsctl event put quick-start \
--data '{"id":1234,"username":"name","birthday":"2022-11-21"}' \
--id "1nd" \
--source "quick-start"

• get dead letter

vsctl subscription dead-letter get --id 0000001241000010 --number=10

• resend dead letter

vsctl subscription dead-letter resend --id 0000001241000010 

• No code

[codecov]

Codecov Report

Merging #420 (a1fa092) into main (2a78cb5) will decrease coverage by 0.49%.
The diff coverage is 29.11%.

❗ Current head a1fa092 differs from pull request most recent head 1d5b7ec. Consider uploading reports for the commit 1d5b7ec to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #420      +/-   ##
==========================================
- Coverage   57.71%   57.23%   -0.49%     
==========================================
  Files         180      181       +1     
  Lines       14614    14880     +266     
==========================================
+ Hits         8434     8516      +82     
- Misses       5552     5735     +183     
- Partials      628      629       +1     

Impacted Files	Coverage Δ
...ernal/controller/trigger/validation/subscripton.go	69.29% <ø> (+0.85%)	⬆️
internal/gateway/proxy/deadletter.go	0.00% <0.00%> (ø)
internal/gateway/proxy/direct.go	73.33% <0.00%> (-5.24%)	⬇️
internal/gateway/proxy/proxy.go	24.90% <0.00%> (-0.19%)	⬇️
internal/trigger/client/gcloud_functions.go	0.00% <0.00%> (ø)
internal/trigger/client/grpc.go	0.00% <0.00%> (ø)
internal/trigger/client/http.go	0.00% <0.00%> (ø)
internal/trigger/client/interface.go	0.00% <0.00%> (-19.24%)	⬇️
internal/trigger/client/lambda.go	0.00% <0.00%> (ø)
internal/controller/trigger/controller.go	29.76% <16.00%> (-0.59%)	⬇️
... and 13 more

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