feat(sink): support resend destination

[ngjaying]

• Add http, rest sink support
• Add docs

[codecov]

Codecov Report

Patch coverage: 70.00% and project coverage change: -0.02 ⚠️

Comparison is base (7af9b26) 61.38% compared to head (0811ab0) 61.36%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2119      +/-   ##
==========================================
- Coverage   61.38%   61.36%   -0.02%     
==========================================
  Files         281      281              
  Lines       32931    32942      +11     
==========================================
  Hits        20214    20214              
- Misses      10800    10805       +5     
- Partials     1917     1923       +6     

Impacted Files	Coverage Δ
internal/io/http/client.go	81.43% <ø> (ø)
internal/io/memory/sink.go	45.83% <66.67%> (+0.28%)	⬆️
internal/io/http/rest_sink.go	57.78% <72.73%> (-1.05%)	⬇️

... and 9 files with indirect coverage changes

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