object/put: use sync.Pool for temporary payloads

[fyrchik]

No description provided.

[codecov]

Codecov Report

Merging #2139 (bf9f8b8) into master (dcdf27b) will increase coverage by 0.01%.
The diff coverage is n/a.

❗ Current head bf9f8b8 differs from pull request most recent head b7a6270. Consider uploading reports for the commit b7a6270 to get more accurate results

@@            Coverage Diff             @@
##           master    #2139      +/-   ##
==========================================
+ Coverage   30.76%   30.78%   +0.01%     
==========================================
  Files         382      382              
  Lines       28095    28056      -39     
==========================================
- Hits         8644     8637       -7     
+ Misses      18717    18687      -30     
+ Partials      734      732       -2     

Impacted Files	Coverage Δ
cmd/neofs-node/tree.go	0.00% <0.00%> (ø)
pkg/services/tree/sync.go	0.00% <0.00%> (ø)
pkg/services/tree/options.go	0.00% <0.00%> (ø)
pkg/services/object/get/assemble.go	89.23% <0.00%> (ø)
cmd/neofs-node/config/tree/config.go	100.00% <0.00%> (ø)
pkg/local_object_storage/shard/mode.go	100.00% <0.00%> (ø)
pkg/local_object_storage/shard/shard.go	69.29% <0.00%> (ø)
pkg/local_object_storage/engine/metrics.go	0.00% <0.00%> (ø)
pkg/local_object_storage/pilorama/inmemory.go	100.00% <0.00%> (ø)
pkg/services/tree/service.go	8.37% <0.00%> (+0.02%)	⬆️
... and 3 more

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[carpawell]

Could you explain the idea a little?

[carpawell]

My fault: i did not notice getPayload call and thought that Pool was used write-only.