Sign multipart objects in the gate

[smallhive]

Closes #975.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 30 lines in your changes missing coverage. Please review.

Project coverage is 26.67%. Comparing base (bbde4d9) to head (b038931).
Report is 73 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/neofs/neofs.go	0.00%	30 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1001      +/-   ##
==========================================
+ Coverage   26.63%   26.67%   +0.03%     
==========================================
  Files          88       88              
  Lines       14400    14564     +164     
==========================================
+ Hits         3836     3885      +49     
- Misses      10135    10244     +109     
- Partials      429      435       +6     

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[carpawell]

Dont we need some tests for it? Test code can be unified with SDK/node. Otherwise, it is impossible to keep everything in sync to me. Multiple codes do the same thing.

[smallhive]

Dont we need some tests for it? Test code can be unified with SDK/node. Otherwise, it is impossible to keep everything in sync to me. Multiple codes do the same thing.

I checked the code with s3 gate tests locally and GH pipeline did it as well

[carpawell]

s3 gate tests locally and GH pipeline

@smallhive, i guess without #974 it also worked well but contained errors, right? I do not mean this must be done in this PR (at least something should appear in SDK) but I think we can discuss it at least. @roman-khimov

[smallhive]

@smallhive, i guess without #974 it also worked well but contained errors, right? I do not mean this must be done in this PR (at least something should appear in SDK) but I think we can discuss it at least. @roman-khimov

It's make sence